Oh man, that sounds kinda cool... I don't think I'd have a clue what to order custom wise though... the only angles and lengths I know are ones on bmxs.
I didn't either. Went to a fitter got fitted, got some drawings, sent them to Waltly with what I wanted in terms of BB, Headtube, Mounts, Tyre Clearances, Axle Standards, Cable Routing etc.
They did the rest...@pjhobs has just done similar and has almost built his new one up
Get a custom Titanium frame with a King Headset and some nice forks for £1k from Waltly or somewhere similar. I love mine