Me too!
I had the same problem. I tried everything to get it to fit properly (installing cleco's in different orders, etc.). I do have a QB fuselage (not sure if this makes a difference). I finally gave up and ordered some aluminum from ACS and used the original F-7106 as a pattern, leaving a lot of excess around the edges. I "match drilled" the new aluminum sheet with the original F-7106 for all the holes except the holes that tie into the F-718L/R and the firewall (i.e, I drilled the holes for the sub panels). I clecoed the new F-7106 to the sub panels and had a friend hold the skin up against the side of the fuselage while I back drilled the holes thru the new F-7106 and added cleco's as I went. I used the F-718L/R as the drill guide. After all the holes were drilled, I used the original F-7106 as an "edge" guide to mark the edges. I just clecoed the original F-7106 to the new F-7106 in a few places and marked the edge. After all the edges were marked, I trimmed and deburred the new F-7106. In short, a Royal PITA!!!
I hope this helps.
Jeff