Is the center drive from a tower terror? Looks very similar if it is not...
I really like this idea, cant wait to see the finished results. The tlt axle should be fine, but you may want to invest in some straight axle adapters, and the one piece axles.
Adapters:
http://rc4wdstore.com/product_info.p...roducts_id=563
One piece axles:
http://rc4wdstore.com/product_info.p...roducts_id=567
And this looks like a great idea:
http://rc4wdstore.com/product_info.p...roducts_id=600