Thanks for the continued input on this. I see what you mean by finishing a
vertical seam. The paneling is this ugly cedar board stuff, with a ~1" wide
by .5" deep depression between the boards, hard to describe, but like
there's another board on the back between every 2 you see on the front.
Also has a very rought finish. It's stained at the moment, could be
painted, but it would still look like crap. I know the best way to go is
horizontally, it's just dealing with sheets that size & getting them here.
Was planning on using that rental truck HD has available, but I don't think
the bed is more than 8' long. I think I'll further investigate the sizes
available, as well as renting the equipment to hoist it into place, then
just have the sheets delivered. I *HATE* drywalling anyway, best to plan it
out so as to limit the mudding!
Thanks again for all the helpful replies, and thanks R for that good