This is a great idea, and the secondary site can be made to look like your forum so that nobody would tell a difference that they're "leaving" Tek to download an animal file.
One of the things I've been looking into is coding up a simple static HTML/CSS site that would serve as nothing more than a file link aggregator for the Northern Skies files. No PHP/SQL requests, no user registrations, just pure HTML and a stylesheet. Github Pages is the most popular place to host something like this for free. The great thing about this strategy is if Github pages ever goes down or says I need to leave, I can just copy/paste the same HTML/CSS files elsewhere like nothing ever happened because there isn't an SQL database to migrate. All I need to worry about is figuring out a solution for how or where to host the actual files to link, but I have some $7 or less ideas. I like your suggestion of a Google Drive.
I can let you know if it works out. Sadly I'm a poor boy while in school, but I'd be more than happy do donate my time coding something similar for Tek if I can help. Sadly this would only address the download files. I know how big SQL databases can get, but that's a whole other beast and I'll openly admit I'm terrified of databases.