I have downloaded the slow stick plans, but have not found a build video, not sure how to set the dihedral or how the two halves of the main wing are joined?
The real slow stick has a center section that has beveled edge flanges you glue or tape together to set the angle and bent wire reinforcements for leading and trailing edge held on with a tape covering. Flexes mightily in large G manuevers and sometimes has more diehederal when it lands than when it took off.