I am looking to upgrade my sanitation system on my 30ft Sea Ray. I currently have a portable toilet in the head. There is about a 5 gallon holding tank on the bottom of the portable unit. The tank has a suction line that goes to a macerator. The macerator has a y valve that goes overboard or to a pumpout fitting on the deck. My intention is to add a toilet that uses the current plumbing and macerator only eliminate the overboard fitting and put a tank in the place of that on the y valve. The macerator is in a cabinet under the sink next to the toilet location. I would need a left side outlet toilet as the macerator is to the left of the toilet and a bottom drain toilet would not work. I don't know a lot about the marine systems but from researching I think this would work. I just need a shopping list. What would you recommend to accomplish this upgrade? I think all I need is the right toilet and a holding tank and some pipe and misc. parts and pieces. I just do not know how to integrate the current macerator into the flushing of the new toilet. Thanks for any help or direction!