My meshes arent loading properly.

Well we can barely see anything in those images and what the issue actually is. Though if you're just missing triangles you may have missed to set the indexbuffer format.

By default Unity uses a 16 bit index buffer and in the past this was the only index format it supported. Though you can now set the index buffer to 32 bit. A 16 bit index buffer only supports vertex indices up to 65k (so you can only have 65k vertices). You can have as many triangles you like as long as you don't have more than 65k vertices. With a 32 bit index buffer you can now address indices up to 2 billion.

Make sure you set the indexFormat before you start filling any mesh data.