To help ease my mind and try to get my life together again, I began building the last gift my dear deceased friend and boss bought for my past birthday - a Sig Somethin' Extra. I have the fuselage, tail surfaces and left wing panel built. When I slide the panel into the fuselage I notice a gap in the rear and front of the panel about 3/32" from where it meets the fuselage. The center of the panel lies flat against the fuse. I thought I was careful when I glued the end root rib in place but apparently there must have been a warp or something I didn't notice. What is the best way to fix this without sanding to the point of being too thin at the wing's root end?

To those wondering, I know you will think I am wrong, but I am still not ready to fly my trainers yet (either emotionally or financially) as that is something me and my friend wanted to share together and almost a month after his passing I am still devastated and trying to scrape by. I am, however, flying my electric-converted Gentle Lady glider which doesn't need an instructor to learn. It is fun yes, but still emotionally distraught.

Thank you for whatever answers are provided.