He is a good case of making a old model work for you.
I have a few old Rhinos I bought off a guy a while back.
They look like he painted and put them together with his feet.
I usually only scavenge the hatches but I had one that was not too bad and decided it could become a decent looking Transport.
I gave it a quickie re prime not caring if it was too thick because Nurgle rides look all scuzzy anyway.
Then I base coated boltgun metal which I tinted with beastal brown and hawk turquoise to give it a nice dull weathered metal.
Then I applied liquid mask with a sponge and then gave the model a dusting of Tamiya white spray.
I removed the mask to get a nice chipped effect and applied a weathering powder wash of Tamiya Orange Rust and Rust powders.
I still need to add some extra length to the exhaust pipes.