Polo Freecycle

I'm building a polo bike. Got an old mountain bike frame (and bits) and I'm just de-rusting it... Now I want to use mostly 2nd hand bits and pieces. Maybe you can help me / and/or have some of the missing bits somewhere in your garage and not using them anymore - for a few quid...? I know, there's 56a, will go there as well, but want to see what I can get before. Here my list:

1st of all:
Set of 26'' wheels + tubes + tires
Crankset - maybe a new one? What do you recommend - without having to spend a fortune?

And also:
sprockets/freewheel dep. on wheel
stem
short, straight handlebar & grips
bmx-pedals
chain
(brake) cables

Check my thread http://www.lfgss.com/thread76086.html

selling tyres,stem and can also do dmr pedals for £5 which aren't on there yet