Yes, I too was/am concerned about flutter and I asked Lockwood about that, but I just can't remember what we discussed. I do know that they apparently, along with Van's I believe (but don't quote me on that) have spin tested it, and it checked out well. My current understanding is that Vne is always a True Airspeed, but I could be wrong.
I'm also thinking about possible mountain wave gust/G loading at altitude & speed. In fact (save the negative comments), I'm even "considering" a chute since it makes my wife happy & we are talking about the bleeding edge here for experimental. Per Lockwood, there is a net 80 lbs of savings so it maybe would be a wash, but I have not looked into it yet, especially how it may impact the CG that they worked so hard to keep centered by extending that nose. Not to mention, this makes the costing math even worse, as in might as well just go buy a VL-3 or even a Sling, or a ...?
Thanks for the info on the 9a Sidewinder. I did see that, but that airframe work is a bridge too far for me to cross, as I will be at my patience and technical limits just with the firewall forward and panel stuff. I'm in S. Fl. close to Lockwood, so I asked if they would just do a conversion for me, but the said they don't currently have the resources, but may one day consider that as an option.