Sounds a little high
Ger,
If that is a boat yard price tip to tip complete, I quess it is ok. Iam assuming that you are putting a second tower station? If so match the steering head, it should tee into your lower head. The contriols also go down to your main station. I would think because you are going into a tower leg that you would use the plastic as apposed to cooper.
I did my second station for about 1500 in parts.