Orguroid and Nickick toys or models from Super Dimension Century Orguss - there were a number of different toy variations made. Those don't look transformable (are they?), so they may have been the smaller scale one-form-only toys. EDIT: It looks like they're specifically from the "System Mecha" part of the line. Non transformable figures which had skeletons upon which you would hang the external armor parts. http://www.toyboxdx.com/datafiles/data/takatoku2/orguss2.html
I used to have a plastic model kit of the first one (on the left) - think it was marketed as some sort of Robotech mech by Testors?
Yes. There were a number of model kits that were incorporated under the "Robotech" model kit line, including kits from Orguss, Macross, and others.
i have the 10 inch transformering version which is pretty sick, although mine is fairly beat up. ive been trying to watch this show for a while but can you imagine...gasp...i cant find anyone with a VCR player O_O