[1.16.1] Custom Shield

I have created a custom shield but now it works not perfectly so my questions are:

1. how to set a costum texture because my shield has either the normal texture or no texture

This is the Render class:

package net.luis.cave.render;

import java.util.List;

import com.mojang.blaze3d.matrix.MatrixStack;
import com.mojang.blaze3d.vertex.IVertexBuilder;
import com.mojang.datafixers.util.Pair;

import net.luis.cave.model.EnderiteShieldModel;
import net.minecraft.client.renderer.IRenderTypeBuffer;
import net.minecraft.client.renderer.ItemRenderer;
import net.minecraft.client.renderer.entity.model.ShieldModel;
import net.minecraft.client.renderer.model.ItemCameraTransforms;
import net.minecraft.client.renderer.model.ModelBakery;
import net.minecraft.client.renderer.model.RenderMaterial;
import net.minecraft.client.renderer.texture.AtlasTexture;
import net.minecraft.client.renderer.tileentity.BannerTileEntityRenderer;
import net.minecraft.client.renderer.tileentity.ItemStackTileEntityRenderer;
import net.minecraft.item.DyeColor;
import net.minecraft.item.ItemStack;
import net.minecraft.item.ShieldItem;
import net.minecraft.tileentity.BannerPattern;
import net.minecraft.tileentity.BannerTileEntity;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.client.event.TextureStitchEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.common.Mod;

public class EnderiteShieldRender extends ItemStackTileEntityRenderer {
	
	 private final ShieldModel modelShield = new EnderiteShieldModel();
	 
	 public void func_239207_a_(ItemStack p_239207_1_, ItemCameraTransforms.TransformType p_239207_2_, MatrixStack p_239207_3_, 
			 					IRenderTypeBuffer p_239207_4_, int p_239207_5_, int p_239207_6_) {
		 
		 boolean flag = p_239207_1_.getChildTag("BlockEntityTag") != null;
		 
		 p_239207_3_.push();
		 p_239207_3_.scale(1.0F, -1.0F, -1.0F);
		 
		 RenderMaterial rendermaterial = new RenderMaterial(AtlasTexture.LOCATION_BLOCKS_TEXTURE, new ResourceLocation("cave:entity/enderite_shield.png"));
		 
		 // Show the Vanilla Textures -> RenderMaterial rendermaterial = flag ? ModelBakery.LOCATION_SHIELD_BASE : ModelBakery.LOCATION_SHIELD_NO_PATTERN;
		 
		 IVertexBuilder ivertexbuilder = rendermaterial.getSprite().wrapBuffer(ItemRenderer.func_239391_c_(p_239207_4_, this.modelShield
				 										.getRenderType(rendermaterial.getAtlasLocation()), true, p_239207_1_.hasEffect()));
		 this.modelShield.func_228294_b_().render(p_239207_3_, ivertexbuilder, p_239207_5_, p_239207_6_, 1.0F, 1.0F, 1.0F, 1.0F);
		 
		 if (flag) {
			 
			 List<Pair<BannerPattern, DyeColor>> list = BannerTileEntity.func_230138_a_(ShieldItem.getColor(p_239207_1_), BannerTileEntity.func_230139_a_(p_239207_1_));
			 BannerTileEntityRenderer.func_241717_a_(p_239207_3_, p_239207_4_, p_239207_5_, p_239207_6_, 
					 								this.modelShield.func_228293_a_(), rendermaterial, false, list, p_239207_1_.hasEffect());
			 
		 } else {
			 
			 this.modelShield.func_228293_a_().render(p_239207_3_, ivertexbuilder, p_239207_5_, p_239207_6_, 1.0F, 1.0F, 1.0F, 1.0F);
			 
		 } 
		 
         p_239207_3_.pop();
         
	 }
	 
	@Mod.EventBusSubscriber
	public static class ModAtlasTextures {

		@SubscribeEvent
		public static void onTextureStitchEvent(TextureStitchEvent.Pre event) {
		    	
			if (event.getMap().getTextureLocation() == AtlasTexture.LOCATION_BLOCKS_TEXTURE) {
		    		
		    	event.addSprite(ModelBakery.LOCATION_SHIELD_BASE.getAtlasLocation());	
		    		
			}
			
		}
		    
	}

}

and my second Question:

I use the vanila item models but the blocking model dosent work so what i have to change in the model:

this is the shield model:

{
    "parent": "builtin/entity",
    "gui_light": "front",
    "textures": {
        "particle": "block/dark_oak_planks"
    },
    "display": {
        "thirdperson_righthand": {
            "rotation": [ 0, 90, 0 ],
            "translation": [ 10, 6, -4 ],
            "scale": [ 1, 1, 1 ]
        },
        "thirdperson_lefthand": {
            "rotation": [ 0, 90, 0 ],
            "translation": [ 10, 6, 12 ],
            "scale": [ 1, 1, 1 ]
        },
        "firstperson_righthand": {
            "rotation": [ 0, 180, 5 ],
            "translation": [ -10, 2, -10 ],
            "scale": [ 1.25, 1.25, 1.25 ]
        },
        "firstperson_lefthand": {
            "rotation": [ 0, 180, 5 ],
            "translation": [ 10, 0, -10 ],
            "scale": [ 1.25, 1.25, 1.25 ]
        },
        "gui": {
            "rotation": [ 15, -25, -5 ],
            "translation": [ 2, 3, 0 ],
            "scale": [ 0.65, 0.65, 0.65 ]
        },
        "fixed": {
            "rotation": [ 0, 180, 0 ],
            "translation": [ -2, 4, -5],
            "scale":[ 0.5, 0.5, 0.5]
        },
        "ground": {
            "rotation": [ 0, 0, 0 ],
            "translation": [ 4, 4, 2],
            "scale":[ 0.25, 0.25, 0.25]
        }
    },
    "overrides": [
        {
            "predicate": {
                "blocking": 1
            },
            "model": "cave:item/enderite_shield_blocking"
        }
    ]
}

and the blocking_shield model:

{
    "parent": "builtin/entity",
    "gui_light": "front",
    "textures": {
        "particle": "block/dark_oak_planks"
    },
    "display": {
        "thirdperson_righthand": {
            "rotation": [ 45, 135, 0 ],
            "translation": [ 3.51, 11, -2 ],
            "scale": [ 1, 1, 1 ]
        },
        "thirdperson_lefthand": {
            "rotation": [ 45, 135, 0 ],
            "translation": [ 13.51, 3, 5 ],
            "scale": [ 1, 1, 1 ]
        },
        "firstperson_righthand": {
            "rotation": [ 0, 180, -5 ],
            "translation": [ -15, 5, -11 ],
            "scale": [ 1.25, 1.25, 1.25 ]
        },
        "firstperson_lefthand": {
            "rotation": [ 0, 180, -5 ],
            "translation": [ 5, 5, -11 ],
            "scale": [ 1.25, 1.25, 1.25 ]
        },
        "gui": {
            "rotation": [ 15, -25, -5 ],
            "translation": [ 2, 3, 0 ],
            "scale": [ 0.65, 0.65, 0.65 ]
        }
    }
}