wrote

The Mermaid looks nice. Might need larger engine for better useful
load. I've always wanted a widgeon. Are there other single engine
pushers? Here's some intereresting videos:

Aircraft Spruce and Supply has plans and materials for another
pusher/seaplane/amphibian, but I can't for the life of me think of the name
right now.

It (and as will most other offerings) fall well short of you desired useful
load.
--
Jim in NC