That is a lot of work you have on the go there. I like the idea of cleaning up the castings so as to avoid adding after-market. I sometimes try this myself, with mixed results, but is is satisfying if you can pull it off. I saw the Vauxhall Ambulance advertised recently and having got the staff car, which is very nice, I wanted to see how this compares, it does look good. The other stuff is modern and I don't know enough to comment on them, but they do look nicely moulded kits, I look forward to seeing all this lot built up.
All the best,