Thanks for the comments guys, really starting to see some progress. My next piece of fun will be the canopy.
I masked the inside of the canopy with masking tape and painted it like Grendels had said. Quite fiddly but semed to work OK when painted. Only missed a few bits where the masking tape did not quite get into the edges.
I want to use the maskol to do the outside, just to try a different technique. I will take some pictures of that.

Forgot to do that for the inside. Keep forgeting I have to share my progress! ( I know I don't have to, but its nice!)