surely if one were removing the floppy drive to make space you'd stick the CD drive there.... e.g. my "1250"
http://amiga.org/gallery/photo.php?lid=995it seems a bit od sticking it on the left.
however, on the subject of power supplies: does anyone know what -12v is actually for? as asked earlier in the thread. as i have some small psus out of a big fat server setup that only deliver 12 and 5v. they originally powered two large scisi drives each (and i mean LARGE, the pair would be equivilent in mass to a car baterry!) and i reckon i could squeeze it into my aforementioned 500 case mod. but alas no 12v. unless, of course, i could use an inverter to deliver the -12v, but that depends on the rating etc.