I think I'm going to like #1 best, too. Sometime next year, I'm going to try a box-pleat with the Marton Mills Jura in MacGregor of Cardney.

Be sure to look at them from a distance as well as close up. Pin up the fabric, then back up about 20 feet for a "sanity check."

With #2, using the red block, you might be able to pick up half a green stripe on each side and thus get even pleats inside/out. i have not stared at it enough to decide whether I like it. [edit] We might get in trouble with the stripe disappearing in the fell, that way. I've no box-pleat tartan experience, yet.

Without the green, #2 will definitely give you a hint of lawn-chair bum effect. Not bad if the bum in question is fairly narrow, but IMHO not the best choice. I have a Sport Kilt like that...