Ya know what Sean? I think I'm going to retract my last.
You have the book. In thinking honestly about it I think you should make a kilt following the book exactly. Once you have a kilt under your belt you will understand all of this stuff far better than we can type instructions.

You will understand on a basic, gut level, why the book says to do something. And why it says to do it a certain way.

After that first kilt you can think about inside left straps and other stuff. Because you will understand much better the how and why a kilt is made.