I have been making various types of clothing and accessories for a very long time - about 35 years - but it seems longer.

I would say that there is nothing which will spoil the enjoyment of doing anything faster than having to work to deadlines or under pressure to turn out quantity.

If the kilt making can be kept to a passtime level then maybe it will remain a pleasure, but if/when it gets stressful it can spoil the doing of it entirely.

However - to make kilts for others is a high calling - and it means that you get to look for, select and handle good fabrics and use them to create a garment with status.

There is little investment required other than the purchase of the cloth, and your time, so you are not going to have to factor for machinery, other than a good iron and maybe a sewing machine. Even if you are doing the construction ot the pleats by hand you will most likely want to make up linings and waist bands etc with a sewing machine.

If you do decide to go ahead I wish you good luck.