Dont waste time with two servos, this pane flies great with the single servo set, and I have never had an issue landing it. I would do a dihedral mod by reducing it down to about an inch, it will be less like a trainer and sportier too. Mine is bolt on, what I did was take the rear brace that goes at the back of the fuse where the wing mounts and copy that to a 1/4" plywood, then glue the ply to that piece after it was installed. The wing I dont remember if I needed to add balsa blocks to where the bolts go or not, so consider that area when assembling.
On the front of the wing I made a notch behind the leading edge where the two halves join, and glued in a 1/4" plywood piece, that hangs down about an inch or so, and put two dowels in that, I also put 1/4" ply in front of F3(windshield area) so the pins have something to hold onto. I also made it a tail dragger. Somewhere there are pics of it, but dont know where at the moment.