Its a plastic tub version of the evo 3. Its a bit on the expensive side here in australia but its still good value as you get front and rea ball diffs. Stanbridges have one for sale for 385, but I have seen then on ebay cheaper than that. withh shipping i could get for for the 250 aussie mark from hong kong from stella models.
If you do get one then pretty much all the evo 3 parts will fit up to the tb02 withh exception to the motor mount and steering assembly. there are specic tb02 parts for this. the ssg centre brace is a nice idea as the plastic tub does flex abit. I am going to wait and see if tamiya are going to release a a carbon reinforced tub before i buy one. for now my evo 3 surikarn will fill race duties