Biggest concern with V_ne on this plane is flutter speed. There are a few built that have a V_ne higher than 200mph, I seem to remember 230mph somewhere. Mass balanced control surfaces are a must here.
Also remember that, while Part 23 uses IAS to placard flutter speed because IAS is the most useful number in a cockpit, aircraft designers often hold that flutter speed is more precisely stated with respect to EAS or TAS. Put another way, the indicated airspeed at which flutter will occur decreases with altitude. Not often an issue in the certified world, but it did creep up on some of the RV's and eat into their flutter margins.
