First, I'd go with 9/32" or 7 mm wire instead of 5/16". You don't need 5/16" wire for the forces exerted on a W32's rig. The
boats have such an easy motion and the external chainplates provide way slack
shroud angles and the relatively short mast just doesn't put much load on the rigging. Anything more than 9/32" wire is just added weight aloft which the W32 doesn't need.
The first time I Rigged our W32, did it in two days. Took two days only because It was the first time I'd used Norseman terminals or rigged a boat for that matter. Was cautious and wasted a lot of time with the first few fittings. After a few fittings, got the hang of it and a bit of confidence built up, was able to do a fitting in less than 15 minutes and made really quick progress. Still, there are a ton of fittings to do wih the boom kin, bowsprit and staysail. When we changed the mast, don't ask, redid the wires in a couple of hours though we didn't have the boomkin and bowsprit wires to mess with.
Attach the snubber to the bobstay fitting. The pull is much lower down so gives a better catenary and the boat will sail a lot less at anchor. Used to remove the snubber from the bobstay fitting on longer passages and reattach the tether when we got to our
destination. Left it in place for one 500 mile
passage and it came through with no problems. Used the same tether for 24/7/365
anchoring for a year and a half and it was still in good shape at the end of our
cruise. Attached the tether when we anchored in Hiva Oa and removed it for the
passage back to
Hawaii when we sailed north the following year.
Work out an arrangement with your new bowsprit to rig a Solent/Asym.
spinnaker forward of the headstay tang. A solent rig will make setting really large reaching
sails a no pain proposition and way eaiser to set an Asym forward of the headstay than behind it. Doesn't have to be a lot of distance between the headstay tang and the Solent/Asym tang. You've already got a bowsprit and only need enough room to furl the sail if you go with a Solent Rig.
Your cost for the external chainplates seems a bit high. You can buy the stainless already cut to the proper lengths and drill the holes yourself if you have a drill press. Even if you don't have a drill press, you'd probably be way ahead money wise to buy a
cheap one, drill them yourself and then send them out for electropolishing. I wouldn't do the square holes for carriage bolts like the original Westsail factory setup. The corners of the square holes are stress risers and a source of future cracking. After you are pau, you can sell the drill press. If you bought a used drill press, might even make money on it.