Can't provide a "one size fits all" schematic...
Too many variables even in identical make model boats. However, I can provide you with guidelines to follow that should make it fairly obvious what you need to do on your own boat Unless you're building a boat or have a completely gutted bare hull, and only referring to the H34 as comparable, I doubt that you're actually starting from scratch...all production boats big enough to have toilets etc had them.Start by reading the articles in the Head Mstress Reference Library, e-mail me (peghall@bellsouth.net) with a few more details and questions, and I'll be glad to help you select the right toilet and spec out the sytem that's most appropriate for your use and the waters you're in.