I started a 65" WS Royal/Marutaka P-51 Sr. when I was young and relatively inexperienced as a builder, then put it aside for decades. About 10 months ago I decided to revive the project. In the course of construction or during the various moves and storage over 23+ years there appears to have developed a twist in the left horizontal stabilizer.
Unfortunately I didn't notice this prior to glassing it 23 years ago or during the recent finishing stages until I started checking(yes, late...I know) elevator alignment and decoulage. As you can see painting and detailing are also completed leaving me with a real conundrum.

Is it possible to correct the twist without damaging the finishing work that has already been completed? If this were a simple Iron-on covered area the solution would be equally as simple but I have never had this kind problem on this type of build/finish.
The construction is much the same as a typical main wing, LE, TE, and ribs but NO spar, then sheeted, epoxy glassed and painted. Wondering how this would respond to heat and opposite force or just long term, gentle opposite force bracing?

The pics are a bit "busy" with the checker pattern but you can see the negative LE washout at the tip in relation to the root. The elevator is neutral at the root, and is flat and true, so the relationship is pretty obvious at the tip; looks like down elevator.

The twist measures at @ -3 deg. at the tip. Is this enough to worry about? Should I just let it be? How much would this affect the flying characteristics?


Posting in tips&techs and scale also.

REAL QUESTION FOR THIS BOARD:
The twist measures at @ -3 deg. at the tip. Is this enough to worry about? Should I just let it be? How much would this affect the flying characteristics?