planning on alot of overnighters and wondering for those that know ,,how stuffy is it in the 23.5 as there is only one hatch at the bow for air to circulate? have seen on the newer brands a window has been installed in the riser below the cockpit seat can this be done with the 23.5 /1993 model without running into an end result of having structure /strength damage? does this added window have any pros/cons? any tricks or ideas to keep from stale air all night ? thanks