I am still working on putting that together. Other projects and day job get in the way
Roughly 50 unique parts, guessing about 5 minutes per part, that''s over 4 hours of work. My usual price is $20/hour so I'd do it for $85. Do you have a quantity in mind? DigiKey has different numbers for different packaging: singles, cut tape, reels...
Just more memory?How about 128K, 16K SRAM?http://www.crossroadsfencing.com/BobuinoRev17/
I attached a BOM for a board very similar to the mega2560 it uses most of the same component's. One major difference is it uses a FTDI chip for serial communication. I found all these components on digikey, and the board has been tested with these components. Hope this can help.