Defnetly interesting. maybe you come up with a concept to reuse old FPGAs as well. Like all those spartan boards out there (without memory) could be used in a chain to work with scrypt?! (Just guessing here, i don't know much about this)
There are other issues involved beyond memory.....we went down that road already a few months back.
Operatr: If you need help I am happy to give any assistance. The point of the fpga is to build value into LTC, we are not out to squash any potential competition. PM me if you would like any help I can offer.