I have some experience writing software, so I don't have a problem learning something new quite fast. If no documentation I read the code, that's no the problem.
Polymer looks good, but I'm not sure yet. I haven't seen nothing serious done with it.
Yes, I've built an SPA using backbone + marionette before, but on top of that I needed something for UI, at the time I used JQMobile (huge mistake).
I really would like to avoid JQuery, and any other "big" framework like Angular. React, only gives me a render engine, so I need third party libraries for everything else, so, not an option.
I'm just interest in the frontend, I have clear the backend part.
My guess is this network is something the government have under control, and they are just experimenting to see how people behave in a connected environment.
I worked as freelancer in Cuba for over 10 years, so having internet was top priority for me. I started while studying in the univ, stealing professor's accounts who had internet access, some friends were separated from the university when got caught, fortunately I made it through. After graduated the real "illegal activities" began, met a friend of a friend who was selling "legal" internet dialup connections (56bkit/s) 120 hours a month for $160 (yes! dollars), "legal" meaning: foreigners students in cuba are allowed to have internet from their rentals, so someone inside the telecommunication company (only one in cuba ETECSA) created one of these accounts for you. Eventually this guy was caught too, and my hunt for connectivity started once again. A bug on an government controlled intranet allowed you to navigate (only HTTP no HTTPS) if you happened to know a magic query string, hmmm need outside help, talked to a friend outside cuba who had a hosting to put a tunnel/proxy on port 80, this didn't last long either, next option, a guy in a government company was selling internet (illegal dialup, but only at 33kb/s for technical reasons), this was "technically" 24h, but you shouldn't used on working hours for obvious reasons, $250/month, for the first time I was able to download something greater than 50MB without resume. Oh!! HTTP 1.1 what a relief!! websites serving files without resume don't know the pain they cause to us. Well, all sorts of these stories happened until I found the "GUY", this guy had internet via satellite, he paid the subscription to HugeNET through a third party. He built a wifi network with APs and some handmade antennas, but to join to his network you needed to have an potent AP at least 50 ft from the ground and be located nearby one of his APs. After managing the infrastructure I finally had a decent internet connection, at a minimal cost $150. At some point HugeNET cancelled all the connections in cuba, and happiness ended.
The bright side of the lack of internet in cuba is that you really need to focus and learn the hard way, there's no way you can see a youtube video, skype, play games, or load endless facebook pages; every time you have an error, the answer is not two google/stackoverflow clicks away.
You need to learn about everything, from communication protocols, to how the browser's cache works, to repair your own computer. No technical support, no skype, no G3/4 on your phone, nothing, just 56kbit/s max 5~6h a day, and a hard drive full of pirated books.
There are a lot of people freelancing in cuba, so if at some point you had outsourced some work and your provider disappear for a couple of days, don't be so hard at them, they might be fighting harder than you think to deliver.