Aloha Molly,
So far we (Yurts of Hawaii) are the only legitimate company that is doing what you are talking about. I started the business about 9 years ago and LOVE the work. We help with any kind of yurt as far as drafting or permitting, plumbing, electric, set up, etc., but we only sell yurts by one company (We chose Colorado Yurt Company and have been extremely satisfied working with them).
This route has major advantages as long as you choose an excellent manufacturer, and as long as you do good, integrible business for your part. With one manufacturing partner, you can have the ability to make needed changes for your local codes/climate, get a bit of a dealer discount, and really be able to back up a solid product with solid services. I don't recommend splitting your loyalties up between different manufacturers, but remain helpful and good to all yurt makers.
Find your favorite makers and see if they'll work with you. Not all of them will. I think there have been plenty of people with this idea in the past, but they've never made it work for some reason. AVOID small time manufacturers in this situation, and manufacturers with a number of complaints. They can't handle their part because they don't have the experience and in the end, and their flaws will likely be the end of your company. Don't make the rookie mistake of going cheaper to make more money. Go for QUALITY, set up an HONEST business, not a get-rich-quit plan, and I think you can't help but find some measure of success with that as your premise. I have found great success, but I don't define success with money alone.
In Cali you have major challenges. Codes are one. We have done a lot of work with codes over the years though, and band together to some degree as an industry. We always welcome more people to help with that cause.
California's laws on contractors are VERY tight and highly penalized if you aren't careful. My advice is to find a good, reputable (that is important. You want someone with an EXCELLENT reputation who will also keep their prices reasonable - Not dirt cheap, that has it's own issues. But reasonable) contractor to build the platforms, licensed plumbers and electricians and anyone else who is needed for the entire build so you have them to call when you need them. Collect your 'team' that can gain experience, help you problem solve, and be your 'go to' partners when you need them. This is easier said than done. You will likely go through a few bad apples before you find your match.
Then you can do project management, working with your team. That's what I do. I hand selected our designers, architect, engineers, plumbers, electricians, and builders. I work directly with our clients to cultivate and figure out their vision, then we help them make it happen.
I would not EVER do so much as a simple yurt set up in California without being under the umbrella of a contractor &
. Cali is just too whacky/strict/law-suit-conducive with it's building laws.
There, hope that helps! Let us know if you want to chat. We've talked to several people who have had this idea over the years, but so far, for some reason, no one has actually done it. It isn't get rich quick like a lot of the cheap-o housing of today. But that isn't really integrible work/money anyway. Our yurt work is fulfilling, honest, fun work. And it pays the bills, bonus!