The roofing challenge

Here is one big roofing challenge... This is a selection (!!!) of the carriages that now need roofs.

Now this is going to take a while, scoring and cutting out 10 thou brass sheet, then bending it, soldering them on...

So, I'm starting to think about how I can fast forward this process? Bending bars and guillotines seem way too expensive though (at least £100 each!). Anyone got any ideas?

Colin