A person or a non-person entity (trust, corporation, llc, etc) can own a suppressor. There is a lot of information on the subject. You would want to Google this for the most comprehensive information.
You can make your own suppressor AFTER you have filed a Form 1 AND been approved.
Form 1
I know that only answers a couple of your questions. There is a lot of information out there. You will have to wade through it all.
Good luck
jonblack