I'm installing a wardrobe at the edge of a window in my 1930s apartment. The sides of the wardrobe are plumb, but the window frame is not, as you can see in the photo -- about 5/8" over roughly 63"H. (The lower piece of blue tape in the picture marks where it's about 1/4" off, and the upper one about 1/2".) There's no easy way to straighten the old metal frame -- opening up the wall isn't feasible -- so it seems my only option is to compensate for it. (I am able to drill/screw into the frame.)
I thought about covering the entire wardrobe side with 1/4" drywall or plywood, extending back into the frame to make a single surface, but that would leave the extra 1/4" sticking past the door at the front and I can't move the door. Something like thin Masonite would fit at the frame bottom, but I don't know what support I could put behind it with so little depth available (and the frame's vertical lip prevents attaching anything behind the wardrobe). So, I'm at a loss, and would really appreciate any ideas. Thanks so much!!
