How tall is the Taito? I thought it was 7 1/4 like this one?
The Taito is more about "volume/girth" than vertical height (which is actually not hugely different from the SSC.) The Taito has very flat feet that aren't quite accurate - the lower part of the R2 foot is way too foreshortened - so with that corrected it comes up to the right height.
Next to the both the Sideshow and Tama 3PO's, the only R2 that has looked proportionately right to me is the Taito just in terms of overall size, not just height.