Stainless steel kegs - especially when buffed and polished - look good and add a very nice bling-factor. When I was at the hardware shop I actually picked up a flap-disk with thoughts of polishing the stainless and making it look pretty. However, I returned the disk to the shelf when I realized I wanted my brewery to be more about making good beer than looking good - besides it's not as if anyone, except myself, will be looking at it anyway.
While it is uglier than bare polished steel, insulated kegs are more logical and sensible, and while the energy-cost-savings are likely to be small, they will add up over time. In addition since the brewery will be electric heated, there is no problems with open flames or melting insulation to worry about.
The insulation was cut into strips 15inches high and 52-53inches long, I used the 32mm hole-saw where holes for fittings were required, and used the roll of tape as a template to cut out around where the elements will fit.
The bottom layer of insulation was a little more difficult to install fit, since it didn't really want to stick down in place..
The bottom layer of insulation needed to be made more shifter-friendly, so that the valve and fitting could be more easily maintained: