I ran into a few bent pieces of stock with my LT-40 kit and my Sig Somethin' Extra kit. I think it's just the nature of the beast when you have long narrow pieces of lightweight stock that might occur. In any case, the stock was pinned in place for the build and glued to the structure straight and then it was good to go.

The TE pieces for the LT-40 are pretty beefy. As long as the curve is not too extreme and you manage to get it pinned in place solid before you build you should be okay.