I think it a really good tartan and that you did a good job,
where did you do the customization?
As it can be expensive getting the fabric made and might need to order a bit extra material than expected

A)It looks a good match just in the blue section in the original theres three black lines, in yours one blue stripe has three then the next has four so you might want to ask a kiltmaker about that.
B)I cant see anything wrong with pleating to the stripe, depends what colour you want showing on the pleats
C)I thinks its a nice tartan, and wear it with pride.

My grandads middle name was johnston and all his family called him "Jonty"