Hey Matthew,
Dont be discouraged, you have to start your ideas off somewhere. Might as well be here. You may make a few funky turns on the way, but then... youll know. You are on the right track. Get the manufacturers to produce REVIT components (for a fee maybe) to distribute them to people that want the libraries. Its done with AutoCAD blocks and other softwareproducts. you dont need A/E letters... bake the cake and they will come eat it.
Heres some ideas for you. I work in the AV integration and IT industries. There are a couple company called Altima Tecnologies and D-Tools that cater to the end users of this design indstry. Altima has a product called NetZoom which started off as a design tool for Network engineers, and grew intothe residential AV industry. D-Tools focuses mainly on the Res AV industry.
These companies both make symbols or have Manufacturers submit them for us engineers to use so we dont have to spend countless hours making blocks with measurements, costs, BTU calcs and other data embedded in them. However, both companies base their stuff off the MS Viisio platform, but are migrating to AutoCAD. Since you are not in a competing industry, and working in REVIT, you may be able to contact them and see what method they use to get manufacturers to participate. The Netzooom paople have been at it for 10 years and have a 30,000+ object database, to they may have good advice for you. If you look ath their demo WMV, they are intense on how they get updates and objects synced with you. I would look at it as cross-industry collaboration. So give it a shot, it dont cost nuthin.
So... when you get that started, and want to branch to the AV industry, we shall talk!
All the best to your endeavors. And dont let anyone tell you no.
Herse's links to their sites:
http://www.altimatech.com/home/index.php
www.D-tools.com
Contact Blake
George