Hey yeh I did same install on my 98 272 with marineaire 6000btu , I used the thru hull fitting for water for the toilet and switched it to fresh water from tank . Mounted pump and strainer under stbd side mid berth , it must be below water level , also that water pickup wont work while your're underway , but works fine at dock or on the hook . Its kinda tight under the steps to helm but will work there . I put a vent in the middle step to cabin and one in the bathroom. Return vent filter mounted on rear wall of mid berth connected to ac/heat unit. Drain tube from pan goes into the shower sump. There is plenty of room for ducting on both sides and under midberth floor, I had to make a splitter for ductwork that goes on top of unit and sends air both directions , if i remember correctly I bought it from lowes, 4 inch duct tee . Hope this helps , it took me a few weekends from start to finish while doing other upgrades , but well worth it. Good luck C Hook