I have a GS I got...at some point that I don't remember?(In a lot of Macs or something I think), but haven't done much with it besides remove the battery. It does have a SCSI interface card in it, so I should pull it out and start playing with it
I love the IIgs. I still have the original my family purchased back when I were just a wee lad. Sadly, my son blew out the VGC by hot swapping disk drives. I was able to get a ROM3 mainboard for cheap off ebay a few years ago and drop it in as a fix, but I'm still looking for a replacement VGC to repair my original board. But the ROM3 is nice. My current setup has an Uthernet II, TransWarpGS running at 14MHz, the CFFA3000, a VidHD, DarkSound Stero card, and a 4MB RAM card by Briel. I also put a replacement power supply by ReactiveMicro to keep everything running. It's such a fun machine to jump on. Man, the deals with the devil I would have made to have these upgrades as a kid... .
I'm curious about those fans, I have one on the power supply cage, which brings hot air from the slots area and up through the top of the IIgs case, but I keep the lid on.