Thanks! I took styling hints from the IIcx to the point where I was even measuring features with calipers. The "minor" lines on the front hide the primary vents, there are secondary vents in the vicinity of the picoPSU as well as the 060/cache board to draw air over the heatsink. I hadn't thought about setting up for an external floppy (actually, floppy never crossed my mind at all...), but I have plenty of space on the rear panel so I might do that...
