Sure, I don't mind sharing info.
The total weight penalty is about 70 pounds, more or less. For the current kit price, contact SuperSkyrocket at
http://www.superskyrocket.com/pages/menu.htm.
As far as labor goes, its fairly intensive, but most important would be to have a shop that's done it before. Dave Jonas, the IA that runs my FBO shop, spent many hours doing it on my P337. After the job, I asked him whether he's comfortable enough to flat quote the job for another Skymaster owner, and he said YES. The actualy quote would depend to a certain extent on the plane and its configuration, i.e. does it need the accessory case mod.
If anyone would like to consider this call Dave at 845-336-8400, ext 165.