I've got the Alsa Mirrachrome Killer Can kit. Haven't tried it out yet though.
But there is another way to get a chrome finish:
Formica Laminate - Mirror Aluminum
http://www.formica.com/publish/site/na/us/....2021.0001.html
I got a 4'x8' sheet (they wouldnt sell it to me in smaller sheets) for about $165. That turns out to be $6-7 a square foot.
Its very thin (.040") & bendable. It can be easily cut with a scroll saw & router. I scored & cut out smaller sized sheets out with a carpet knife.
An adhesive is used to adhere it.
If the guitar top is carved, then it might be very difficult to get the laminate to form over it.
If it is flat (i.e. a Strat style body) then it shouldn't be a problem.
How to integrate the edges of the laminate into the rest of the body, is another problem to overcome.
One could use binding or just leave it as is.
The good thing about laminate is that has a wear resistance (its used for counter tops).