I have a model 2 genny that I could take moneyshots of (ruler included at your request) but unfortunately no model 1 SCD... I believe the SCD would be wider if thats what you're getting at, probably by about 2 inches or so.
I've been informed that for my purpose a model 1 genny and a model 1 sega cd togethor would be a better combo. If the size fits my purpose I'm going to try and get my hands on a dead model 1 genny and dead model 1 sega cd ^_^. I wanna gut them and put a computer inside lol. (assuming the measurements are fairly compatible).
if you are going to do that i would use a model 1 and not a model 2 at all, the space is smaller and it looks ugly. This pc mod you wanna do is only for looks and not functionality so then you would only want a good looking combo.
oh and good luck making the mod, cause the tray area is a bit to big for a pc cd rom. its hard to explain why but if you take a scd 1 apart you will see what im talking about.
I'm used to seeing inches, but either side works for me. And yeah, I figure I'll use model 1 for both parts, then I'll probably end up using a slimline drive for the cd portion... hopefully that'll fit in the sega cd portion better than a full size.