Thanks for sticking with this - you got it.With all that you really need to do, you will have to cut it up a bunch. The wing carry through, you stretching the cockpit or laying it back, is the tail length/volume going to be ok, landing gear, engine mount? You might be starting with a Sonerai fuselage, but it’s not going to be one in the end. You really are going to build another plane.
The most "sensible" approach in many people's eyes might be to buy one of the complete older RV3's with few avionics & less-desirable-to-modern-eyes engines like maybe a high time O290 that come up cheapish from time to time because original wings have the same spar issues that early Sonerai 2's did. Original spar RV3 wings are de-rated/ aerobatics not permitted anymore. So swap in the B wings. If i had been to the machine shop auction and acquired "Lot #123, contents of this corner: pile of scrap aluminum and possible airplane parts" before buying the complete Sonerai 2, that could have been my approach. Having happened a year+ afterward, i can't afford to manage the transition on SS. Nor especially can i afford the fuselage kit, engine, and completion items for an RV3 build. I spent time with the Van's online catalog and on the phone with them last year.Selling or trading to either get an RV fuselage or Sonerai wings would make more sense.
Sonerai is complete with S mod wings.
Ideally it needs fuselage mods as you described. (My preference)
It is faintly possible that blowing a new, taller canopy to extend back over the turtle deck could fit it to my longish torso with the seat back reclined a little. I'd still like to add some area to the tail/rudder.
Not fond of the paint job. So, if fabric comes off, it might be easier (and perhaps more interesting) to complete & use the -3 wings than to strip the S2 wings and repaint. If original wings go back on, i'd still add the Hoerner tips. Aerodynamicist friend with former Sonerai interest has indicated willingness to advise either way.
However, this is straying pretty far from the interest of the original post.
Which is, there are a number of ways to go, to satisfy different intents including my personal curiosity "what if" bent.
Ideally, I'd like the most efficient way to an EAB, and that will probably require a few conversations with one of our local FSDO guys, as has been suggested by others. If that is not "somewhat efficiently" possible, then putting the original AC back together for Exhibition will take precedent.
Biggest concern is ability to continue to mod it, and to maintain it between annuals.