The Model Mechanic run by fellow collector and custom builder Steve Nasburg provides on his Fcebook group, conveniently divided into photo albums by category, 3D printed kits from Truck & Earthmoving Equipment replicas, Work Tools and various parts in 1:64th, 1:87th and 1:50th scale for the discerning (Caterpillar) collector or custom builder.  

A must have are his both Weld Decks for Caterpillar Dozers. They have designed generally around the Caterpillar D6 Series Dozer by Diecast Masters, but you may have to modify either deck mount to suit.

These Welding Decks are mostly used for support on Pipeline sites. The back deck has four Miller XTM350 welders inside the box, which has a lid you can slide in as open or push closed using friction fit. (Test as you proceed). Furthermore it  has a power distribution unit, welder box, air compressor and generator. The front deck has a swiveling roof, toolbox, different welding tanks, and an acetylene torch. Both Platforms are individually available.   

Curious? Click on the upper two photos!