I have some drywall up on some walls that used to be thin panels, and the gaps between the walls and the window frames are pretty large- 1/4"-1/2" in areas depth-wise (aka, when looking at the window head on, the drywall is closer to you than the window frame by 1/4"). It seems to be variable in a few areas as well, so ripping a straight piece would work for some but not all.
I can think of a few ways to fill the area, but what's the easiest way to get a good fill? I'll be filling in the tiny gaps with caulk, so it doesn't have to be perfect, but the closer the better.
I've thought about holding up a thin piece, marking the line with a pencil, then following it on the bandsaw, or putting up a reasonably thick piece and using a power hand planer to get it down to the right thickness. I suppose there are lots of ways to skin a cat, but does anyone have any thoughts? Any pitfalls I should watch out for regarding wood movement or similar?