Sam_w-
Seems like the kind of thing I'd think "oh I'll cross that bridge when I get there" and then realize elbow grease and determination isn't enough. You will damage your materials.
I see how you could plan for some angling, but there's less wiggle room than you think. I wonder if you don't need to put a batten at the top beam? it would just rest on the beam it's self and you could use more of the angling magic. Fingers crossed everything is square or else.... gaps. some may be quite large.
what about getting a good router and making a slot in the ridge beam to sit the panel inside? then no gaps... Although "clever" this is definitely a bad idea. don't do it.
personally, I'd mount strips and do it in panels with deadman supports, sheetrock, mud and tape.
again I'm no builder.
good luck.
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bright
Not to state the obvious, but you wont be able to fit the panels in the top section without some careful planning or doing it in two length wise sections with a new center beam thing.
I'm not a builder, but I can easily see the opening is narrower than the piece youre fitting.