Scott, I like "modelinstructions.com"--simple, descriptive, direct.
A couple things though--can you legally past up instructions on a domain, without clearing the publishing rights through the companies? You'd better check if the trademark/copyright laws govern that before you wind up putting a ot of time into something that might have to be taken down, or worse--invoke a paid fee from you for a violation?
Just brought that up, cuz as a musician with all kinds of things in the public domain I know there are issues that pop up...