Can you share the name of the maker with us please.
I will address your picture in order.

The Selvedge edge is a normal tuck selvedge found on fabrics produced on a rapier loom. The little 'fuzz' you see are the ends of the yarns. This is normal.

The little tucked up and sewn 'hem' is also normal. This is done to keep the "apron tips" from hanging down and showing under the apron. This is normal.

On the Apron facing of this kilt you can see the line of machine stitching so this is not a hand-stitched kilt. It does hang down a bit more than you would expect on a hand-stitched kilt but about average for machine stitched.

It is normal for kilts to be made from one 4 yard piece of fabric that has been halved along it length and joined to create an 8 yard long piece. The maker did not align the stripes very well. I also expect that on the other side you will see machine stitching and perhaps serging. Can you show us the other side of the join please.

I have searched the Scottish Register of Tartan and also the Scottish Tartans Authority and can find no listing under the name Spirit of Bruce. Is it possible that this could go by another name?