I measured the head compartment thoroughly and finally decided I could buy a standard-sized electric flush toilet to replace the marine-sized manual flush toilet. I purchased a Raritan SeaEra QC and brought it to the boat. It's obvious that the base won't fit the platform without some significant surgery. Sue is pissed and wants me to send it back. She's happy with the marine size, but I'm definitely not. Has anybody made a good modification? I woke up this morning convinced that I can cut out the back panel to make it work. I'd be happy to hear any experience others have had. Actually, I'm quite surprised that Catalina seemed to skimp in this area on this model.