How to make a plug for Composite Amphibious Floats

Ever wanted to fly on water?

First of all, this is a work-in-process.  The plug is not yet complete. In fact, as I write this, it is in storage, ready for next steps. That next step would be to finish the plug, and then use it to either make a mold or start making parts.

Secondly, this is just a pictorial journey.  

As a brief overview, I created a design for a float in CAD, then exported into slice files for cutting in foam. They were stacked and shaped, then glued to a plywood bottom base. Fiberglass was applied for strengthening, also some aluminum rails.

And that is where the project sits now. It's in storage.  :-/