Wow, that's exactly what I wanted to do to my Classic (and the whole reason I bought it in the first place), only I managed to get it working and I didn't have the heart to butcher a working compact Mac so I sold it intact. I wanted to do the CRT-shaped plexi as well, and after seeing yours, I'm even more confident it's the way to go.

Very nice work! Probably only thing I would have done different is to use a more powerful motherboard (probably socket 1155) and I was thinking to keep the vertical metal frame from the analog board and making brackets to mount everything to that metal frame so the back cover could be completely pulled off and machine still working like the original setup.