The silver looks great.
For those who don't know, this is actually a pretty old hack, at least in certain locations. I've seen several of these types of machines crop up on Buyee (proxy for Yahoo auctions Japan), but usually they are either 650 or 7100 logicboards inside a IIci case.
I made my own as I had a spare 650 board and the IIci case is my favourite. Did exactly the same, cut out the rear ports, and some of the stand offs to make the 650 board fit.