Now that you've shared that additional info I think you should just scrap that idea. The systems needing outright replacement are going to be excessively expensive as they're not easily "scrounged" and are specialized marine items.

Best thing to do to get closer to your dream is to start touching it. Either join up with a cruising club or grab some friends to rent a boat and put some blue water under your keel for a week. Find out what it's like by living it as much as you can, even if only for a few days. The knowledge will start flowing to you and a wealth of human experience will be at hand through the friendships you'll forge in that environment. That'll help set your compass for the true path you need to follow.

I know I'll be looking forward to your posted photos of where that path takes you.