Honestly, trying to patent the thing probably wouldn't be worth the cost. Getting a patent isn't cheap. Better bet would maybe be to try and market the plans instead. The plans would be subject to copy rights, which are much more straightforward then patents. Might even try taking some high quality photos of the construction process and writing up a "How To" article to submit to one of the magazines like ParkFlyer. Set up a quick and easy website with a PayPal link to sell the plans to coincide with the release of the article.
I would pay $10-15 for the plans. I buy plans all the time.