That's not exactly designing a bike from ground up...just buying a frame a putting parts together.
Also, why did you take off the front brake on your hybrid...?

Anyways...

The Jury frame has weird measurement for brakes...
http://bikeisland.com/cgi-bin/BKTK_S...ls&ProdID=1184

Velo Orange has good looking stems for good price.
http://www.velo-orange.com/haandst.html

VeloMine has a good selections of wheelsets for reasonable price.
http://www.velomine.com/index.php?ma...x&cPath=87_172


More sites for fixed gear stuff...
http://www.benscycle.net/
http://store.somafab.com/
http://www.cyclingcloseouts.com/Mini...4-0934a2ba746f