Tonnage was a thought... maybe not the best. It would be irritating to have someone build a 1:1 scale Death Star as their allotted strategic arm though. 
Prototypes... no, one, with sufficient wording to prevent the "no, hey, this is a different model it doesn't count!" thing. I mean we're in a META thread, we can discuss the desired result while leaving it to IC attornies to hash out details, heh heh. Stress testing you can do of individual components, while prototypes would be more for validation of capabilities, testing tooling, whatever... or you can break it if you want, but you don't get a new one until it's scrapped.
I'm not sure how to do the authorized shipyard thing, as being exclusionary sort of rubs me the wrong way, but at the same time it really would be nice to monitor. Maybe something along the line of people who intend to build stuff of this scale notify the appropriate folks and allow occasional visitors to see what's up.
Prototypes... no, one, with sufficient wording to prevent the "no, hey, this is a different model it doesn't count!" thing. I mean we're in a META thread, we can discuss the desired result while leaving it to IC attornies to hash out details, heh heh. Stress testing you can do of individual components, while prototypes would be more for validation of capabilities, testing tooling, whatever... or you can break it if you want, but you don't get a new one until it's scrapped.
I'm not sure how to do the authorized shipyard thing, as being exclusionary sort of rubs me the wrong way, but at the same time it really would be nice to monitor. Maybe something along the line of people who intend to build stuff of this scale notify the appropriate folks and allow occasional visitors to see what's up.