Skip,
The Goldberg kit is, I agree, not as scale as the Brodak kit can be. It's all in the documentation vs model.
I assume you built the wing to the short configuration in the kit, I'm not sure how that outline and measurement scales out to any drawings but should be closer than the long wing in the kit. The real airplane had no dihedral.
There is no controversy about the color, Kreimendahl was quoted, his wife was quoted and son was quoted through the years, it was 1949 Cadillac Chartreuse with Chinese Red trim, markings dependent on which year, race, etc . Cadillacs are painted this color in classic car restos, just posted one in the last 12 months in this forum. No problem.
If you look through the airplane's history, it was this color until it was painted apple green in the early 60s, then in light blue and orange Gulf colors in 1966 like a Ford GT40, or then had its wing changed to a high aspect Stockbarger design, and then to its Circus Circus colors in 1977. It exists on display in the San Diego Aerospace Museum in this final paint scheme and configuration, the original wing is on a different fuselage painted apple green in the Planes of Fame/Air Museum in Chino, CA.
I'd build the Goldberg kit for RC flying myself, buy and build a Brodak kit for Sport Scale but there is nothing wrong with your plan at all. Keep in mind that what ever drawing you choose for your docs you shape the model that way. I used blow ups of my docs to draw shapes of wing, tail, fin, etc right on the model part and sawed them out accordingly.
If you find your decal sheet, use it as a comparison guide to all fonts when making your markings, modern decal makers make wrong font choices often and it's seen on models and full sized airplane restos all of the time.
Sounds like fun.
Chris...