Interesting blog post. My two cents.
The backscatter is what is most interesting. I have read a lot of stuff about backscatter. What I wonder is will it remain open and not locked away by patents. I also wonder about "prior art". Because Disney is not the first to "research" this idea.
There is a book by Vernor Vinge describing this so I think Vernor has "prior art". But probably the technique can be found in nature and that trumps all claims to "prior art".
The plastic case is not bad but plastic doesn't dissipate heat well at all and I think it actually traps it.