Nice nab, I've actually got both, but I'm saving my dual slot riser MoBo for some hack that can make use of it!
My 6360 is a G3 466 equipped Plotter Server and used to be my AV center before I got a 32" 720p HDTV and got my old-school RCA 5.1 system cookin! up in the bedroom.
If you're REALLY sneaky, it's possible to move the speaker, bend a support, and install a FULL Length PCI card in your new toy! I haven't yet put in the necessary (likely to need to be split) SCSI cable extension into mine to wrap around the full length card so as to enable re-installing the CD, but it's very doable, IMHO.
Congrats on your acquisition!
jt =8-D
p.s. forget the case plastics, that series looks way cool in just its metal undies! }