single slope roof sheds as designs for sauna buildings, with different paneling types, gathered from around the web for reference:

simple shed with vertical plank paneling. roof is just nailed on plywood? proportions of this shed look good though, solid, apart from roof (*note goats/dogs/overalls)

more vertical paneling with rafters/metal roof

wide plank vertical paneling, not as good as narrow, note roof has no fascia just plywood - proportion looks wrong

how shingles look on shed style buildings...not as good, but better for weather than planks?