Tiny Core Linux looks interesting. Played around a bit in a VM tonight and will be trying it on the ThinkPad tomorrow. I'm curious about your setup. I assume you're using 9vx directly for graphics, no more drawterm? You run within X?
My attempt tomorrow is going to be giving a GB or two to Linux and the rest to fossil, trying to integrate the localfs and native ethernet patches to 9vx, and booting off that. The combination does look like a very nice starting point.