Pops,
Welcome! Thanks for the intro! Quite an interesting ride!
On flat fenders, you'll be able to choose between a CJ-2A, CJ-3A or CJ-3B. There are some subtle and some less subtle differences. Lots of additional information found on the 3A and 3B Pages (links at the top of this forum) and also on these sites (Note: the CJ-3B Page has a large collection of information on additional models produced):
https://cj3a.info/index.htmlhttps://www.thecj2apage.com/The island idea (fiberglass) has some merit but there's other things, i.e. springs, chassis, nuts/bolts, etc. that will need some attention. Does that location have washing or storage facilities? I'll confess, I don't have any experience with coastal issues.
I had to look up an Amilcar and remember reading about it. Interesting.