how is it that Caterpillar isn't building and selling these P5000 power loaders from the Alien movie? Whatever they cost, there will be buyers.

Cosplayers at Comic Con have made them, why the hell isn't Caterpillar? 

https://cults3d.com/en/3d-model/various/caterpillar-p5000-power-loader-alien-2-1-metre-de-haut