I believe that the SuperFeet Cork insert is an unweighted casting type. To mold the footbed they have you hold your foot off the ground and then they mold around foot. They are pricey $150 US but early season you should be able to find them for $99.
Make sure that you go to a very knowledgeable boot fitter to get the proper fit though. Otherwise you've just wasted your money.
Unweighted are done lying on table I believe - so leg doesn't affect foot. Which is my problem - foot twists on bottom of leg.
To build me a walking orthotic a special slow set plaster is used for the casting, allowing my foot to be realigned to my leg as the casting is taken.
kiwiski - my walking orthotics were nearly $200 oz dollars EACH FOOT from memory - they have almost maximal correction built in & are the newest technology - so they are MUCH thinner than my previous edition - read they fit in running shoes JUST if I buy one with good depth