if HasTak made the two Autobot Combiners from RiD2000 the same size as CW Combiners (in combined mode obviously) how big would the individual autobots haveto be

 

I don't own any of these combiners, but based on math the build team members would be 1/4 of a combiner, which makes them taller than a CW deluxe, but maybe a bit shorter than a Voyager. The trains would be 1/3 of the combiner height, which means they should be taller than a CW Voyager.

This is just math though, so don't take my word for it.