Try this company, https://www.cleanclad.net, they sell a high grab flexible adhesive that allows for expansion and contraction. In my experience cheap adhesives set hard and do not allow for movement. Good luck !
We use EPDM linings for sealing sprinkler storage tanks, the maximum guarantee we give is 10 years. UV plays a big part, so would think 10 years is the most you will get out of this system.
Wow
Looks a bit too complicated to me ! I served on HMS Apollo back in the day and acrew member built scale model out of matchsticks. I tried to buy it a couple of years ago but an antiques shop wanted £1000 !