LB,We had the rear scuppers changed last summer on our Islander and they had to cut an access port under the stern door,it wasn't a big deal in my book,I told them to do whatever they had to do to make it work.I'm going to have the two fittings for the fishboxes changed in a few weeks and I wouldn't be surprised if they had to cut in another door somewhere as both fittings have shutoffs on them,as long as its a neat job,its not a big deal.The place is close to home and if they have a question about anything,I always get a phone call first.