The Machomen, consisting of Boyd, Eli, Elliot, & Henry have theirs built and are continuing development for the big group event.
You can see them cutting out the classic rectangular shaped design from plywood then attaching a soon-to-be legless lawn chair onto the platform.
On the initial design they didn’t cut holes in the shower curtain plastic to route the air into the center, but that ripped off some of the plastic from the pressure. The updated design will be trying thicker plastic and larger holes to get more air into the center of the craft.