I think the front door should be more of a commercial style than a residential since some guys would build a shack while others may build a warehouse, a brewery, a barn, a outhouse ?? There are all kinds of structures of various sizes that can be custom built to fit a specific spot on the builders RR.
It would be great if someone was to volunteer to build a bunch of simple doors and send them out to the participants like how Dave Taylor very generously cut, packed and shipped the gondola kits last time. The door could fit in a regular envelope.
Or perhaps someone could decide on a particular door style then draw up the plan (pattern) with the how to and a materials list then send it to all via a PDF so we could print it out and build it.
The possibilities are endless and you guys are already thinking. Very clever that the door could be leaning up against or laying across a sawhorse.