I never knew the Lisa chip got so hot. I suppose the air in that cabinet doesn't circulate because the power supply is external, right? My rackmount A1200 has a fan in the front directed towards the Blizzard 1260 and one in the power supply in the back, so air moves at least a little.
I thought about trying to find a 1U case into which I could put my A1200 motherboard back in the day - heck, it'd have been a lot easier since I wouldn't have had to replicate the ports - but since it was to make the A1200 colocatable, a PCMCIA ethernet card was necessary. Perhaps you could find a way to redirect the PCMCIA 180 degrees or something like that. It's a nice setup.