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

The good news is that there are at least a dozen flipchips I can think of where that approach should work fine (provided your CPLD uses TTL levels). The bad news is that those flipchips are the most common ones. (Several are on ePay at the moment for $6+shipping.) The problem that I see, is nearly every device made out of flipchips uses one (usually more) of the harder to find flipchips. Worst are the green-handled Gxxx series, which typically have custom linear circuits on them. Also problematic are about half the Mxxx series, the ones that use open-collector outputs, negative logic voltage levels, etc. But much of my gear is looking for one or another of these "special" modules. Of course, the older Rxxx/Sxxx modules also use the negative levels, making them more difficult to do with modern logic components. (The Wxxx are a mixed bag; a little of everything, including simple connectors.)