Hey, glad to hear you like it. I don't use Foundry but go ahead and make a module, I'll run it by someone who does when you finish it and spread the word.
I'm not working on this system anymore, if you want my more modern take on an economy, check out the Battle Century S rules for Wealth, which are a lot more developed and polished without being a full-on money-management minigame.
Good luck and have fun with both projects!