I have been playing with my SS51G V2 lately. Was meant to be my primary retro pc as the OG V5 only works with a few selected boards. I have new plans now 
But I have done some modifications to it. Recapped the original PSU, but is still too loud, so I have to find a Seasonic somewhere. Removed the rear grill, replaced original fan with a really silent Nortua, also placed a fan on the chipset heatsink. Cut the side to make my modified V5 fit. Now I'm designing an acrylic window. I have struggled to get USB 2.0 working in 98SE, but have sorted that out.
Specs:
Shuttle FS51 v2 motherboard
P4 3.06 HT
2*1 GB DDR ram
Diamond mx300
Voodoo 5 5500
120GB SSD with sata ->ata adapter
dvd burner + card reader
I plan to replace the dvd rom and make a new fascia, sand down the original paint and repaint it.