I have the same camper and you are right it's a pain to work on plumbing stuff in there. I have to get in there to winterize my water pump this week. not much room. I don't think cutting the round part in the top paneling would help much, and i wouldn't cut the slot part more cause that keeps your drain line on track. So i can't answer your question except to say they designed it that way for a reason, i guess. Be careful on how much you cut out of there.
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2013 Rockwood popup 2318 g. TV 2016 acadia and a 2013 SLE Sierra p/u
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