Warning, this message will contain some explicit publicity

Thank you to everybody again for taking the time to reply.
I was able to find all that I need on the Catsailor Store and I will probably upgrade to the captive mast system in a few weeks.

As far as the shrouds extenders, I will probably purchase these because I am looking for a way to speed up the rigging of the boat and it will be safer since the stay remain attached even while operating the extender.

As far as racing, there only seems to be 2 beachcat in my area, the other one is a P16.

Also since I will be sailing on a difficult river, this will give me some extra security in case I am not able to right the boat. However, I am quite heavy and I would be really surprised if I failed to right the boat. I have been doing in in a lake but now I am in the St-Laurent River, it is like a small ovean, the river is over 60 milles wide and we have big tides, salt water and even beach