I've finally built and arcade controller. It was pretty easy, though I changed my mind about using a KE72 and decided to use I-PAC 2 from Ultimarc instead. It was brilliantly simple to assemble and has been a lot of fun. I've also toyed with Hyperspin as a front end, but without many games and content, Hyperspin is a chore to find games that work. However, it does come with a lot of documentation and helper programs to organize lists and everything, so I'm going to go forward with it.