Does it count when we use non-stock parts? And never designed to fly? Because this little project grew out of a single objective. Build the biggest, most badass fully functional land vehicle the physics engine can support. Sadly, it's weight is such that even with weapons stripped out, simply moving it across the runway tends to... well, see for yourself I suppose I could try and build bigger, but I think it's big enough. For the purpose comparison, here it is next to my mobile factory complex, a facility that has enough internal foundries, refineries, 3-d printers and external drills to supply not only its own needs (it can produce spacecraft from a deployable rear runway), but supply any facilities on a planets SOI.