I unfortunately don't have a lot of experience doing custom builds. I've worked with a few engineers that do that for a living , but their printed products are a lot more robust than anything I would ever need. I always recommend buying a kit or pre-built as a first printer unless you're trying to industrialize your prints for small business applications. Do you know what your end goal for 3d printing will be? Tinkering with the tech? Printing out design prototypes? Or just somewhere around use?
Not gonna knock down a fellow tinkerer for taking up a new project! Do you want to borrow a printer of mine (its a cheapo ender 3) before making the $$$ plunge into building your own? It should at least get your feet wet. Its not the best printer and could probably use some tuning up... but it will take a lot less troubleshooting than the zidex you're looking at.
I wouldn't recommend it. The build volume is very small for a project thats going to require so much setup and troubleshooting. You will get tons of gratification if you get it running, but the applications for a sailboat will be limited. I will say from an engineering perspective, he does an excellent job explaining what each part of a 3d printer does and why you should use certain hardware specification. Its definitely worth to watch to learn.
The Makos aren't in the water. they need a bit of work but I'll be selling the 17 and 25 when they are done. my sailboat is in the water but I've got to go over everything before we go out this year. bit if work ahead of me.