Hybrids rule!! Funny this thread came up because I was just planning on replacing the shell on my MTH RS3 with a Weaver one. The MTH shell is much sturdier but unfortunately has that flat face that doesn't do it justice. Just found out though that the Weaver shell is just a bit too narrow and I don't want to jam it against the PS3 board components.
I'd really like to find a home for this RS3 shell. It looks like it's almost the same length as a Williams GP-9. If the GP-9 railings line up with the RS-3 cab, it would be easy to drill out a screw hole on each end of the shell to mount it. One can motor would have to go as it would be too tall for the short hood.