Jiri,
I've admired your craftsmanship on the SBD and La-7. I have done similar ARF make-overs on the CMP 109, the Kyosho Spit 90 and the ESM Bearcat (pics to follow). On the last 2 I rebuilt the wings and covered with Fliteskin.
I got the ESM 73" Spit wing second hand with a broken wing from a rough landing. I repaired it but didn't like at all its flying / stall performance. After some investigation I found excessive wing root incidence (2.5 degrees), little to no washout and a very strange airfoil (scale semi-symmetrical at root but thick symmetrical at the tip).
So I gave up on the stock ESM wing and decided to build a nice scale BT wing, cover with Fliteskin and match it to the fuse.