Welcome! I don't think there is anything wrong with your dreams, it'll just take time and money and effort and sweat and blood and.....
We bought our bus from these guys and are very happy with it.
https://www.completeautocredit.com/c...r=&PageSize=25
Even if you don't end up buying from them, it might be worth a visit to look at what he has and get familiar with them.
Generally stick with 2003 and older buses, but the rest of the configuration will depend a lot on what you plan to do with it.