I can help you with the ceiling shroud part, Coleman sells a shroud for rounded airstream ceilings. I think it was $15 (3 yrs ago), there should be a service/support phone number in your owners manual. I am sorry, I don't recall a "tab" issue when I installed mine. Maybe the service/support folks can help you with that as well. Be advised, it is a loud a/c unit, they make a "quiet"fan blade to replace the stock fan blade. Your neighbors will appreciate it!!
Good luck and safe travels,
Jim
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