I picked up an unfinished kit a couple months ago... he's got a lot of things going on in real life at the moment so the wait time to get the product is a bit extended, but that aside, the unfinished kit gives you everything minus the labor on finishing (i.e. staining and sealing the wood) but otherwise the kits are the same. Unfinished starts at $200 and I think finished is $100-150 more at the base level. Price goes up depending upon what type of wood you choose as they are either more rare and/or more difficult for him to work with.
I got maple burl which is normally a more exotic wood price, but I think at the time that I placed my order (early this year) he had gotten a bunch in stock and didn't charge me more so my kit was at $200. Haven't gotten around to finishing it out yet, but he will send a link that gives all the assembly instructions and they are pretty straight forward.
As far as treating the wood, that can be easily found on the web by just searching how to finish whatever type of wood you choose, but that's basically sanding, staining and sealing and even if you've never done any basic woodwork, the information is out there and easy to follow. Just take your time and read through everything several times before you start. If you've never worked with wood before, get yourself a scrap piece of wood to run the whole procedure on so that you are comfortable with it, because once you stain, it's pretty much a done deal. Hope that helps.
P.S. His kits are very nicely done, and his woodwork is high quality, so any sanding you do will only be very light.
Thanks for your in depth reply! Based on what you're saying, it seems like the unfinished kits are a pretty good deal. How about preparing the Fostex phones for the mod...it seems like trimming the baffle/driver is going to be the hardest part of the whole process. Have you got around to doing that and have you experienced any difficulties with it?