Putting up a shed to construct your boat under (or for other things) is a common starting point for the boat builder community. I know I can vouch for the need for cover (since I’ve had to build outside for much of my build).
This technology looks like an interesting way… canvas stretched over a form and impregnated with concrete, which then sets and becomes a hardened structure.
Got to wonder how hard it would be to recreate on your own. Of course disposal might be a bear.