Are there any resources which describe FLT in a very tangible way which will motivate students to be interested in this subject?
Leo Corry had written a reasonably concise note on the Fermat's last theorem (including some historical anecdotes). I found it as a very interesting read. Since, the question included 'motivation' as an aspect, one thing that will help is to introduce the history and drama associated with it. This draft surely will be a helpful one, in that regards.
I recommend this book based on my personal experience. When you start reading it, it's almost impossible to put it down.
About ten years ago I wrote a monograph directed at students with a high school competency. It goes through many proofs of intermediate results that preceded the Wiles proof, but no higher analysis. It focuses on the mathematics, and not the history. I don't know whether it is still in print. See: