cool building and love seeing a build come together neighbor...im also in your area albiet a little lower in elevation pursueing a very similar project...
i went down to O-ville and inquired about permits...holy shit what a headache. just to install a regular garage shop required a whole bunch of things i had to figure out. there have been many many rumors and even news stories about code department cracking down on illegal buildings and illegal terracing/greenhouses so good luck! up at 6k im sure you will be a little safer..
anyways i went a different route and got a commercial metal building and im gonna build out the rooms inside, very similar to your route except doing a mix of 2x6, 2x4, and uni-strut for the walls. no need to deal with silly permits or worrying about someone dropping a dime for code violations. now for my outdoor grow and the newly planned terraces, lets hope they dont see those!
Whhhhats crackin homie . Thats the exact route i was going to go until i found a contractor with some family problems that were affecting his job and needed money haha. I got this cheaper than i could have a metal building the same size. You;ll have to PM me some pics or something as in a few months i am planning on putting another one up on lower piece of property.. How about this weather tho?