The biggest obstacle I see is that the cost of 68030 chips faster than 16MHz has been rising the last few years.   Although, there is a lot of ten 40MHz 68030s for $150 available at the moment.    Many others (singletons) are listed in the $30 - $50 range.

In any case, the supply is not reliable, but for the volumes you're likely looking at, that probably doesn't matter.