build light, exactly. I just held the root of the wing onto the TE stock, drew around it and cut it out. I glued the piece onto one wing half, sanded the TE stock flush with the wing and glued the other wing onto it. It's really hard to get the halves crooked that way.

I get bored doing things the same way, so for the last couple of planes I've started glueing the TE stock on before installing the torque rods. This way I can get the TE a lot straighter (I always seem to get it crooked when I cut the trough first and then glue it over top of the torque rods). It's not any more work to then cut a groove, drop in the rods and plug the groove with a strip of wood. In fact I get less play in the linkage. It works for me.