If we assume you have solved all the legal issues. (big if I know), you plan is exactly what the system is meant to do for you.
Only one small note:
. This is where I'm a bit iffy. If you want to use the proceeds to establish the business, then that might work against you if the people who buy the initial 100,000 sell before you do, right? Is it possible to lock them in the system so that yours is the only sell order? Or do you basically have to hold them, use a website to track who all donate, then distribute when you're ready for them to be traded?
Your proceeds from the sell are in BTS (bitUSD). So you should not care for what price the people are selling after your IPO. So you issue 110k IOUs in your business "MerockStar and Moon Ventures", sell 100K for your expenses @ 1 bitUSD a peace.
My concern is that I'd only get half of them sold at the asking price I'd need to establish the business, then people would start dumping the price down.
Unless the shares could be locked.
I don't have the technical skill to do my own AGS, the way LottoShares appears to be doing. But I do have the technical skill to issue a UIA, and I am more than qualified to create the kind of business I'm thinking about trying to start up... I know I share a lot of high hopes on these forums, but THIS is something I am fully capable of handling. I'm sure of it, and I'm sure I can convince others of that too.
UPDATE: I see here that they can be locked from being traded. Perfect!
As you discovered.. you can set it so that your shares are not on the market. Your concern with others preselling during your crowdfund is exactly what happened to Moonstone where people started to buy and sell from under them while they were still trying to crowdfund.
What you are describing is using it as a debt vehicle. You are crowdfunding a loan. Tonyk already mentioned the legal issues that often surround these things, so I would be careful in that regard. You may recall how AGS was a 'donation' and how nothing was promised.. or with brownies how BM keeps saying they hold no promise value.. this is because the moment you promise something, you are turning those tokens into agreements, and depending on how that goes, whatever regulations may go with that will apply.
Crowdfunding is a fickle beast that I have first hand experience with. I would not recommend it to anyone unless they have the opportunity to work with someone who has run a few campaigns successfully. That said, there are some pretty good ebooks/courses out there that could be useful too.
One thing I can tell you is that it will be HARD WORK. You don't just launch and it sells. You will work full-time both before, during, and after the crowdfund sale in attempting to make it successful. If you don't, it will fail.
Secondly.. if it is a failure.. it will be a public one. Some people have trouble handling that. In some instances, it can also damage your capability to access other capital sources in the future because some investors might take that as a 'signal' from the market that your product is not a seller.
Do you planning.. put together you business canvas model, and then look at the picture and decide if you still think it is a viable option.
Not trying to discourage you... BitShares UIA is a perfect vehicle for this... just be sure you do your homework beforehand.
Let me know if there is anything I can do to help out.
Good luck.