Thanks Nic, I look forward to seeing your thread in the near future... if the list in your signature is anything to go off, there are some interesting things. The 8500 and PB145 are ofparticular interest... also two machines I would like to get my hands on soonish. 
So, the G3 minitower is now successfully booting 8.6 from a CD after replacing the CD-ROM drive (currently using my test drive)... Now just requires a hard disc. IN the process of getting this running I decided I'd use it as a testbeed to verify that my 7600 and WGS drives had definitely failed. I kind of hoped the 7600 was just a bucket and the SCSI controller had failed, however sadly the drives are just as dead on the G3 as on their respective machines. Ah well... I am in the market for some new SCSI hard drives I think.
So, the G3 minitower is now successfully booting 8.6 from a CD after replacing the CD-ROM drive (currently using my test drive)... Now just requires a hard disc. IN the process of getting this running I decided I'd use it as a testbeed to verify that my 7600 and WGS drives had definitely failed. I kind of hoped the 7600 was just a bucket and the SCSI controller had failed, however sadly the drives are just as dead on the G3 as on their respective machines. Ah well... I am in the market for some new SCSI hard drives I think.