Wheelbuilding / Wheel Building / Wheel build help

Nope

No - the 622 and 630 are the respective bead seat diameters, so if you get the bead of a 27in tyre seated on one side of a 700c rim, at the other side it'll be nearly a cm too far out.

(And yes, 29er rims/tyres are also ETRTO 622, so the same diameter rims as 700c and smaller than 27in ...)

http://www.sheldonbrown.com/tyre-sizing.html