I like it.
I agree that using the gold to short rush is a better idea.
I also know that we can hold off any invasion long enough to get the tanks going. Considering how long GS has waited, I would not be surprised that the attack does not happen at 1260 AD, or later.
I know that I proposed stealing techs, but I was throwing that out there as a possible idea. I think your argument against it is very sound, and am in agreement.