Hello,
thanks for inviting me to this bidding contest. it's an interesting project, I need a little more info, like for example if you have already decided on that particular coin acceptor or if you have any restriction of the type of microcontroller you want in the board. I was thinking about a cortex-m3 processor, maybe one from the STM32 family, which has USB 2.0 full speed capabilities. contact me through the chat and we'll talk specifics. I'm expecting to work with you in this project,
regards, Erick Cafferata