I haven't contributed to the project yet, morttheslayer, but plan too!
It's just not in the budget for this month, next month, I hope
I got some great news from DCS (Digital Combat Simulations). I emailed them if they are planning to building some tank models like T90C, Challenger, M1A2 Abrams, and Leopard II. They replied it's in the works, but no release date is set yet. They said all above models would be included.