Nice bus.
Is that a Porsche 914 in the last pic? can't tell for sure, but looks familiar.
Ed's right about the acid bath, or buy an already shiny one for about £25 off ebay. I've got one under my bench thats not nearly as bad as yours rust wise, but its just not worth the time input for something of that value, might be in 10 years though!!!
Good luck
MM