A friend of mine made on years ago; got no pics though, sorry.
But in answer to your questions, yes, a 130 tub was used, with a normal 110 hicap "rear" bulkhead thingy (bit that the challenge truck boys use to give the flat rear end under the truck cab roof)
Not sure what brackets he used to mount it on the chassis though.... the rear crossmember brackets may end up in the wrong place under the tub, but they're only thin plate, so cutting and welding them to the right shape wouldn't be difficult at all.
Would look a bit like the AgRovers of the '80s.... nice!
Get a decent set of tractor type tyres or Simex's and you'd have a handy truck.