Indow interior storm windows
 

I came across this today and figured I'd share. Its a bit pricey, but looks to be a very nice product.

Window Inserts | Interior Storm Windows | Indow Windows

Indow Windows Kitchen Installation - YouTube

What do you guys think?

For people with more money then time or skill its a good one, for those with more time and more skill its a inspiring idea and should be easy enough to construct and replicate.
Using the foam strip one sided tape insulation around the edges should give a tight seal.