I'm in agreement with rhm, the whole point of this bike business is the fun of it, and building a wheel is the funnest, if not also the stretching-est.
I'll stick my neck out and say that you don't have to buy a wheel jig, especially for one or two wheels, just build the wheel in the frame it will be used in.
The head-scratcher to me is in figuring out the spoke length to get. Spokes are not exactly cheap, and buying, hoping you are getting the right length is a step of faith.

Bet your chrome rim is 36 spokes, and a SA hub will be scarce in 36 holes, you may find some pickings in an Austrian Sears hub also.