As a soon-to-be first time builder (at least to completion - I have completed a LongEZ fuselage though Chap. 4, but I sold it in the '80s), I am watching this very avidly. I am extremely CAD literate - ACAD, Solid Edge, and Generic CADD to name a few) and have done quite a few LongEZ drawings. As an offer, I am posting one I just did of the center spar jig (this because I intend to build the center section first, and then the fuselage - this was one of the pieces of advice given early on in the '80s). It is in PDF format and the scale is 1:12 when printed on standard 8.5X11 paper, landscape.
Spar Jig.PDF