Completely in-progress. I got some little motors (12v 50:1 w/ Tang shaft) that are about 12x10x24.25mm. At the moment I haven't got any front caster designed or really even finalized the idea. The FreeCAD model has a model of the motor if anyone is interested. I think it'll probably end up with treads but I haven't gotten that far yet. Completely open to change.