Thanks for that suggestion - I went ahead and purchased the rule set (it's not that expensive), and was impressed how they captured the spirit of the older 1980s robot anime (right down to Grendizer's saucer and rocket fists, to the Mazinger series' Boss Robot) as well as the more militarist Gundam. Not to mention the addition of rules for more conventional armed forces to be used in the game and the steampunk option.
My one problem is that I will be using 1:144 models, for which I have barely any models, scenery included, apart from the robots themselves - unless I involve my N gauge railway models, with trains scurrying around to get away from the battle...