Looking good. I was intending to use factory brackets to mount my S-10 Blazer fuel tank in my '53/S-10 Frame. You gave me the idea of just making my own brackets.
Also, I was looking at your motor mounts. Are they just solid steel? I didn't see any kind of rubber or plastic insulators between the mounts and the frame. Perhaps there are some I couldn't see or just overlooked? Otherwise you'd think the noise/vibration would be pretty intense.