I'm considering making built-in shelfs in 3 walls between 2 gabel dormers. I'm pretty confident that there is no problem doing this in the knee wall that runs parallel to the two existing dormers. However any tips will be appreciated! Where I'm most uncertain is how to add the built-in in the wall that is located under the dormer side walls. I've done a little research and have the impression that the gabel dormer should be supported by the rafters. Is this correct? Does anyone have any comments or resources that I could seek on the internet or library? Can anyone also comment if it's necessary to insulate the backside of the bookcase?