A couple of random comments from an unqualified amateur...
Unless you are a serious racer
, with a good budget
for new sails
, I'd advise going with double-braid for your spinnaker
halyards (same diameter as the VPC you specced). The reason being that the additional stretch in the double braid can act as a shock-absorber which means you are significantly less likely to destroy a spinnaker in a sudden gust.
I don't know what main-sheet system you have (but they all have some degree of purchase
- typically 2:1, 4:1, or more) but frankly 16mm seems excessively large. I would have thought 9/16" or 1/2" would be big enough diameter
Again, I don't know what sort of vang system you are using, but vang loads can be very high. Typically, with a vang, you might have some sort of cascade, so that the first rope
in the cascade seems the full load, the next rope
only sees half, the next half again, etc. So you may well need different diameters of rope for different parts
of the vang... without more details of your specific vang set up it is hard to say