Royloo has done a Macross Valkyrie, and a Gundam RX-78 NT-1 Alex from Gundam 0080. I know those were at least available in the past. I Know He has modelled the titular mecha from Aura Battler Dunbiine too because I've seen it in a pic of his in the Gallery. I Vaguely remember there being a Destroid Tomahawk available somewhere as well.