Thanks to the roof pieces only really being useful for ultra tall peaked designs, anything not rectangular or square will turn out weird because we need like 8 more roof piece designs for all the corner possibilities and peak connections. Anyway, you can either peak this or you can wave it. Or you can just say F-it and put a flat floor and then do the feather method.
https://steamcommunity.com/sharedfiles/filedetails/?id=2943429944