The factory will be assembling the layouts and customizing the spring placement - I will tell them make X units with this spring arrangement, X units with this spring arrangement and these keys, etc. Keys and stabilizer inserts ship in one batch to China in late February/early March, where they will do assembly and installation of stabilizers and keys where needed. Of course if you order no keys, you will not get stabilizer inserts either (they are not included). You can add them to your cart though as I have them listed at $1.50 each.
Key costs are passed on from Unicomp and include the key set, spacebar (separate cost on Unicomp's side), 3-4 stabilizer inserts, and any other custom keys needed for the key set.
There is no kit option. They need to be assembled and tested. I will be testing each one for quality control. One bad spring could cause the key not to buckle.
Techno please take a look at my web site for the drop downs I put in for now. Split backspace with regular layout, vertical 2U enter/plus keys, etc. can be requested by entering a note in before clicking add to cart. The most common layout options will have a dropdown. The rest will be "by request/note only."
A number of GHers suggested to keep the options limited and let those who want to move their caps around, move their own caps around, but just offer the different flipper/spring arrangements to minimize someone having to open up their keyboard.