DuzyMods

Hello, I'm relatively new to modding but I'm catching on quick. I'm modding with 1.7.10, my mod currently has a custom mob, a guinea pig , and I've been attempting at doing what I imagined would be intermediate task, but turned out to be a very advanced one: Creating a cage-block with a base and four walls that when placed next to other cage-blocks changes the render for all blocks, removing the walls in-between the blocks. http://postimg.org/image/gmsz8n711/ I understand the basic algorithm for placing a block and looking to the blocks around it to decide which render to use, what i don't understand is how to use ISimpleBlockRenderingHandler to change the render. My questions are...How does ISBRH work? What class and method do I put my algorithm in? Also... I'm currently using TileEntity to get my cage to render correctly in game and I've heard its problematic, is there a better way to render my block?