Jamestown has several versions
https://www.jamestowndistributors.com/userportal/main.doas does Defender Marine
https://www.defender.comWhat I did through my entire build was to source the unit I wanted at the above dealers then once I found what I wanted I would do a specific search for the desired product Internet wide to find the best price on said product.
That being said, when I built the bunks in the cuddy, I built using the average dimensions of the Portable toilet I intended to purchase. I wanted the comfort height model, with pump out capability and five gallon capacity.
All of the better models will fit in the area allotted.
I chose not to build the specific space allocated for the head because for the most part it will get the least use. Allocating space for a bathroom really cuts back on usable space. For those doing day trips, it might work, but for those who want to do extended trips, you loose major space.