Bear:

Save yourself a lot of bother and frustration. The stock aileron setup in the Sig 1/6 Cub is a bad idea.

Get two Hitec HS-225 servos, and put one in each wing to operate the ailerons.

If it's too late to set it up for dual servos, or you just insist on using a single servo, you can cut the wing srtucture away between the front and rear spars without worry, bettween the rear spar and the trailing edge you can cut it away provided you add material to keep the strength between the rear spar and the wing hold-down screws.

The 1/6 Cub has functional wing struts that carry the majority of the load, so the center structure is not as critical as with a cantilever wing.

Just DO NOT try to fly this plane without the struts. Almost a guaranteed conversion to folding wings.

The plane was designed in the days of silkspan, or silk and dope covering. If you plan to use a film covering you should also use a lot of gussets to reinforce the wing - there are notes on the plan (or in the instruction booklet) about this. Don't ignore it.

When finished you'll have a lot of time in it, but if it's done carefully it is a very nice airplane. But don't try to make it an aerobat.

Hope some of this helps.

Bill.