Hello, Metal tracks may not be a good idea for the Tamiya 2A6 as these will stress the complex gearbox, plastic chassis, idler wheels and return rollers (which are glued to the chassis, not held by screws). Besides, the stock tracks are pretty well made and reliable, hence the lack of upgrade options. The Tamiya Leo is complex and well-engineered and not much can be done beyond what the kit already provides. Have fun.