So much for being anonymous. Ha Ha. I will try to answer your questions. Your hinged floor works. We had more trouble with the 4 strand slipping and had to rebuild slip clutch. It did get more hours put on it though in different conditions. No I do not have 4 inch axle risers on the machine. It is very close though to ladder but they work. We have heads both with and without poly. There is no difference in cab noise between heads or feeders or different years. Yes if the cab doors leak, they will let more noise in. Dry corn is more noisy then green corn. You need to ride in a Gleaner then go ride in a Case to hear the difference. It is not really feeder noise just corn going thru header form being so close to the head and the cab not being very good acoustically at absorbing noise. We try to run our combines at full power if conditions allow and losses are acceptable. The fuel tanks are not big enough if you are doing this for more than 10 hours. You are right on the screens sucking shut scenario. It can happen. It makes it worse. But I think we still get a dirtier sample than we would like even when they are not sucked shut. Dry corn is the biggest problem. We have not had the bigger sep bearing yet. We have worked on both combines separator clutches this year. Nothing better yet. The biggest disappointment this year was putting in steep pitch helicals over thresher side. After hearing for years the benefits of doing this I finally tried it. This was an absolute waste of time with a CDF in my opinion. It gained nothing in capacity and it had more trouble rotor loss in all crops, wheat , soybeans, corn. then the pure stock machine with CDF. I think the steep pitch sheer cobs making it hard to clean and getting more loss. In wheat and soybeans I think it just goes thru to fast. Maybe it works on 25 inch 8 bar rotors but that has not been my experience not with a CDF. I do not think the CDF is a very good small grain rotor. In a pure stock machine a CDF is a lot better in corn and beans then a 8 bar 25 inch rotor. I guess you need 2 different rotors if you are doing a lot of small grains and a lot of fall crop.