Just looked back at an insightful reader comment from Darth Humorous from April 2010 about the difference in scale from the 80 foot set blueprints vs. the current 114 foot full size dimension:
“The plans for the landing gear are based on the 80 foot set. Since you are scaling the ship up to 114 feet per Brown, the feet should be scaled up accordingly. Now, you may have already done so, but you were talking about a 12 inch tube, which is very close to the original landing gear plans. You did mention going to 18 inches for structural concerns. Perhaps you should scale the gear up accordingly to see what the tube diameter would actually be. You might be surprised.”
Math is a wonderful thing.
Get this: Scaling up the 12 inch diameter landing gear/foundation pier by the 80/114 factor gives roughly an 18 inch diameter. So it looks like we will be going with an 18 inch diameter steel-reinforced concrete pier for each of the seven landing gear tubes.