Alright, so I have finall figured out how to make layers and such to display my model on the player. Currently, I can not use RenderLivingEvent because of a memory leak. So, I have reverted to adding the layer to the player in my ClientProxy. This would work fine, but my LayerBipedBackpack requires an instance of RendererLivingEntity:

 

(Minecraft.getMinecraft().getRenderManager().getSkinMap().get("default")).addLayer(new LayerBipedBackpack(need RenderLivingEntity instance for the player));

 

If anyone could provide an answer, it would be very helpful!

When you add a layer to a renderer, you should pass that renderer to the layer's constructor (so both the renderer and layer have references to each other).

 

The values of

RenderManager#skinMap

are the instances of

RenderPlayer

used to render each skin type, so pass these to the layers as you create them.

Should of noticed that. Thank you so much Choonster! One other, tiny problem: in the picture below, you'll see the backpack fully rendering, but these two little textures at the player's feet are very weird. I was thinking it is because my texture size for my model currently 64x64, but I am not sure.

 

Fixed it! Just had to not call the super for the ModelBiped render method. I think I will be posting a tutorial soon on how to render a model on a player in 1.8. Thanks again Choonster!