Thanks for the comments gents

Should have it finished tonight.
You should show them architectural modeller blokes how to make things properly.

None of this is square so I'd get laughed out of the workshop

Looks like you are using cut up plastic tubing for the ridge tiles. Just a tip for future ref. I've found that you can do the same thing using cut up plastic drinking straws. Just bond a couple together to get the right thickness. They are easier to cut and work, as a slice down the middle with a craft knife gives you the basic tile shape and they are a damn sight cheaper than using Evergreen plastic modelling parts.
I tried drinking straws many years ago and really wasn't happy with them for various reasons. I don't mind paying extra for quality materials for a quality end product

How are you planning on hiding the seam where the roof joins?
Just a bit of runny filler, not too much though.
cheers
James