I built a Sig Liberty Sport a few years back that used laminated wing tips. The plans called for and supplied 1'4" wide X 1/16" thick balsa strips. Cut to length and bend to shape the first strip and pin it to your building board. (This is after wetting the strips.) Glue the second strip to the first, bending as you go and again holding to your board with pins. I believe the Liberty Sport used four laminations, if I remember correctly, and I don't recall if it proceeded from the inside out or the outside in. I would have to refer to the plans or instruction booklet to refresh my memory, but I really can't see any difference. It might be easier to go inside to outside, each succeeding strip taking less bend. It really was pretty easy. I used alaphatic resin for this and it did not take long to do. You will, of course, have pins on both sides of the first strip, and the outside pins (if working inside out) will have to be removed as you bend and pin the second strip, here using pins only on the outside of the bend. You don't want to end up with pins between the laminations.