There's been quite a lot of talk about 3D CAD software on the forum lately. Dassault (the maker of Solidworks) has entered into an educational licensing arrangement with the EAA (Experimental Aircraft Association). Join and maintain a membership in the EAA for $40 a year, and you get a "perpetual license" of the student version of Solidworks. Note: I said maintain a membership with the EAA, because the software apparently still expires yearly, but being an EAA membership you get a new authorization code or something. Not sure exactly how this works because I haven't had mine a year yet. And no, you don't have to be a pilot or own a plane. I'm taking a Solidworks class right now at the local community college, and the software is kicking my but, after being an AutoCAD user for nearly 30 years. I keep telling myself "It'll get easier, it'll get easier"!