Help with using .obj and .mtl

So I'm working on porting some Fallout 4 based items (vault door, terminal, locker, etc) and I want to use the .obj items I've created. I have the .mtl and textures as well, however, when I load them into a mod and then load them into the game, the textures don't show up and the items are far smaller than they should be, nor are they oriented correctly. I'm currently in 2022.3 for 1.19.x

Any help would be appreciated. 

Also, where would I submit a suggestion? If there was a way to get .obl or .stl 3D objects compatible with Forge, it'd make this process a lot easier.