Living in the nineties, living in the wil' wil' West

So I got a two story concrete duplex with timber framing for metal panel roof. Hurricane Maria knocked out a NE corner of rain guttering, so that corner has broken panels and some under-drip allows for slight drip coming inside, dripping down wall.

Is there a video or book that's considered a Bible for the roofing impaired? My thoughts, based on slants put to me as marketing subject, include overlaying the existing roof with a rubberized "felt" that's got aluminum covering facing up. [I hear the sheets melted on during application.] Next, a foam board backing by EPS here in Hatillo would add an insular layer. A 20 gauge steel panel cut out available at a local steel fabricator is orderable--icing on the cake? COVID's got everyone's pannies in a wad, so this is to assist my self-dialog in settling which design is most suitable for this Caribbean climate, daily light rain, upper eighties during warm spells, etc.

The proposers [aka contractors] are all over with eccentric ideas, no consensus there, but this is early in the process, so I'm all ears.
https://www.amazon.com/Dumbo-DVD/dp/B07P4J1J8D

Thank you, sir, can audience throw this here dawg a bone? I need to more to chew.
How bout top 3 poly-iso manufacturers (so I can determine if that suggestion's applicable out here South of FL) + top 3 synthetic underlayment producers (LOCAL DISTRIBUTOR)?
Next time I rain dance at HomeDepot praying my Spanglish'll cut it, I won't sound so, how did Michael put it, "That's just ignorant,"? It helps when experts put ideas in my head. I can refer to the better products. Thanks for kind moderation, sir, my facelift is well received.
https://www.thepoke.co.uk/wp-content/uploads/2011/01/Pierslift2.jpg