Congrats on your new kilt. I would recomend sewing the pleats by hand. It's not that difficult. Divide the length of the pleats in 3. The upper 1/3 of the pleats are to be sewn down. Sew from the outside, small stiches along the edge of the pleats and through all layers of fabric. Good idea to leave the bastings in until you ahve sewn the pleats.
Sorry I have no pics to illustrate. Let's see if Allen comes back with some pics.
Skål!