The approach speed of these planes is pretty high resulting in a rollout commonly needing 3000' or longer.
30+ years ago when I was building my Q1 I intended to go right into a Q2 build but where I was on a 2200' paved strip followed soon to a 2700' grass I was advised to not build the larger plane.
The airframe is the same between the Q2 and the Q200.
These planes originally were supplied with pre molded fuselage shells, something really new to the building world at the time such that building without at least the original fuselage will be a completely different scope of work.
Plus the migration to the LS airfoil utilized a Carbon tapered tube spar, although these technically are available again the cost to get a set down to you might not be attractive.