Trespassing into aircraft engineering here, but does not having a relatively short arm between CG and rudder make rudder design and sizing more critical? Look at a C150, the rudder is at least 0.5m further aft of CG compared to a Bristell. In other words, I would have thought The tighter the coupling distance between CG and rudder/elevator, the more critical the design of those control surfaces, but what would I know? I would also expect that the shorter “wheelbase” between rudder and CG leaves less time and room for error in spin recovery.