More Info on These Wagons?

I picked up three of these wagons at a toy and train fair this morning. Now for some fun! It looks to me like there's a better way of doing it; instead of sticking the body onto a Tomy chassis I think I can hack the original Hornby chassis to take Tomy wheels and axles. Watch this space.

(Incidentally there was not one single item of BPT-related merchandise in the whole place, but this little project will be ample compensation).