I designed a similar roof for my macrofig-scale cottage project. If you use a
45-degree pitch you should be able to finish the side edge of the peak with
virtually no gap using one 1x2 plate on the underside of the 1-by's on one edge.
There'll be a bit that hangs down, but it'll look decorative.
Hey all, a couple things to share: A miniature castle I threw together: (URL) a couple pics of a roof design I came up with. (URL) (24 years ago, 21-Feb-01, to lugnet.castle, lugnet.build)