Micheal,
Welcome to the world of old Westsails!
You will find that there are almost as many opinons as there are Westsails. For re-bedding deck hardware, I am old school and prefer polysulfide, but there are many new compounds on the market like 3M 4000 for example.
You should expect to find that every deck fitting is in need of rebeding. Make sure to check all the deck fills. Your decks are cored and leaks in them can lead to rotting core issues, the bulwarks are solid fiberglass.
Your stanchions should have been installed with fender washers as backing pieces, the deck/bulwark layup is very thick and it is likely not necessary to make up backing plates if you have fender washers already inplace.
The cabin top Handrails are normally thru bolted with a bolt, washer and nut and will require removal of the outside bungs (to access the screw heads) and removal of the headliner to access the nuts. Mark the handrails (port/starboard and fwd/aft) before you remove them.
Rebedding the standard bronze portlights is fairly easy as one needs only to remove the fasteners and gently slide a thin putty knife under the outside flange to remove it. There is no need to remove the entire portlight. Just remove all the old bedding from the underside of the outside flange and any remaining bedding on the cabinside. Apply a coating of new bedding around each screw hole and around the edges of the flange. Make sure to get a good bead all around the inside edge of the flange where it meets the portlight. Slide the flange back on to the portlight. Reinstall the fasteners and tighten things back up. I always put a small amount of bedding on the threads of each screw just under the screwhead to prevent any water from running down the screw threads. Clean up the excess bedding and your done. Mark the top of the portlight flanges before you remove them as the screw holes are not all spaced exactally the same. Experience is the ability to realize you've made a mistake afterword...I have experience with this issue...
Have you looked at the condition of the gaskets on the portlights? They may need to be replaced. That is an easy job and Bud has the replacement material.
Rebedding the sampson post is a bit more involved, as removing the old bedding is challenging around the bowsprit.
Check the old posts on this forum, I think I recall someone was looking into having new hause pipes made, but they needed a minimum number to make it affordable.
My 2 cents,
Kevin