So I received the IDE to SATA converter recommended above (eBay), and installed on a ADATA SSD. OS9 works amazingly well, but I cannot get OSX to install. The DVD spins up, spins down, up, down... So I threw it into my Mystic G4 and installed Panther. After re-installing into my lombard, I just get a spinning wheel on startup... Done this several times now, but results are the same. Today, I put an old OWC SATA-2 SSD in, and tried the same. Booted into Darwin initially, but after a couple reboots, eventually I got into OSX. Everything seems slow... Pretty sure I have an Inland SSD around here somewhere, I will see if I can track it down.
In the meantime, I modified my CPU's heatsink (hoping to overclock my 400/66 to 466/83 eventually). The stock one literally is plastic... what a joke. I removed a northbridge heat spreader from a dead MacBook pro logic board, applied some thermal paste and a new thermal pad on top of it and put it all back together. Seems to be working well, the entire laptop cage is pretty hot. Fan still not coming on though, but I'm pretty sure I heard it spin up last week, so I don't think it's dead. Will snap a picture later once I have it apart again.
*Images resized. / FdB