A while back I picked up a military play set that scaled about right with 28mm. One of the vehicles I got in the set was a simple little tank. It is about the size as a Games Workshop Predator tank and I considered just painting it up as is. Then I decided to make it look more futuristic so I added some bits from a 1/35 scale X-wing starfighter kit. That looked ok but it still wasn't right.
Then I decided to turn it into a hover tank by cutting the tracks off and adding some hover drives made from cheap razor handles. I think this looks much better. There are some areas I could cover up like the fact you can still see some wheels and track but I don't think it will look to bad with paint. For a cheapo toy with some junk added to it I'm pretty happy with it as is.