Model Importing problems

[Shane Lee Shin]

So I'm working on a model import that, to say the least, is not going well. I'm extremely inexperienced with models (I'm a sound guy, not a graphics guy). With sonic's model data, I'm trying to replace polygon0, polygon2, and polygon4. I do not have any texures truly prepared yet for this, and I only have blender, a hex editor, and brawl box to work with this. What am I missing? For those who are curious, I'm working on a knuckles based sonic (similar to how project m made a shadow, silver, and tails based sonic). I try replacing the files in brawl box and brawl box crashes.