I see you want to build a commuter bike, but you seem a bit clueless when it come to the options. Before we can really help you we need more details concerning how you are going to use the bike. You may have a short commute now, but what is the possibility that your commute will change or you want to be able to go on longer rides without killing yourself? I can suggest that you look for a bike with slightly more relaxed geometry than the average track machine, especially since you state that velodrome riding will be infrequent at best. I would look for a frame with road or cross geometry. Since you plan on commuting, I would try to find a bike that is at least capable of being fitted with full length mudguards so as to leave you options open.
As it stands, that's all I can realistically recommend given the info you have provided. Good luck!

Cheers
lverhagen