There are other ways to Make a separable Frame , Like good fitting telescoping Tubes and Pinch Bolts..

Tom Richeys Break away Down tube coupler reminded me of agricultural Irrigation piping couplers ,
and the food grade Hose connectors I used on the crushing and filtering machines and Hoses, in my
Overnight jobs at Harvest time, in the Napa valley..

the other separation of his stuff is using the seatpost as a Join span
and clamping the Top tube on in one place, the rear end and lower seat tube on in another