I was talking to BDH yesterday and he was saying how the inside side skins needed to be installed early in the build on the taildragger. I came home and checked the Sling4 inside side skins, which can be installed later in build. I have noticed at the factory they install the front inside skin early during the build. I started installing the inside skins and the left skin would not fit on the front side channel. The right skin fitted very well, so I matched them and found the left skins side channel holes have been punched incorrectly. ( all misaligned along the channel by about 4mm ) This skin is covered by the interior upholstery and will not be seen, so I match drilled the holes. The only thing I did not think about is the wing bolts. I will have to cut the rear lower flange to allow the bolts to be fitted into the main spar. I will cut the right skin prior to installation.