SMT techniques (was Re: group buy for homebrew CPUs?)

I _have_ thought about that for replacement -8/L and -8/i boards - design a simple board with, say, 4 to 6 16-pin SO pads and decoupling caps and a dual row of jumper pads to cross-connect the edge fingers to the various chip pads to be able to replicate, say, an M111 vs an M117. The "problem" is that I doubt you could get real TTL (not LS-TTL) parts in SO. I haven't experimented with replacing TTL with LS parts in any of my -8s, so I don't know if there would be any issues or not. So far, I've always had enough of the right things on hand when I go to replace a chip on an M-series module. I would think that the dimensions could be on the order of 2 x the size of just the area of the fingers. The advantage, of course, is that it would be easy to make a large number of these on one PCB panel, reducing per-unit costs. Using one (or maybe two at most) base designs would also help quantity issues. You could sit down one day and make a stack of a dozen M111s, then make two dozen M113s the next day with the same PCB; just add the right SO-parts and configure the jumpers in the right order, and there you are.