SolidWorks is a 3D modeling package that is widely used. While the retail price is $4000, there is a legal way to get a student copy for free. The student copy does everything that the full priced copy does, except that any drawings are labeled as "academic use only". You can use it for your hobby, but not for business use (making money).
It's a member benefit of the Experimental Aircraft Association (EAA). Check it out:
https://www.eaa.org/eaa/eaa-membersh...esource-center
SolidWorks does have specific requirements for processor, memory, and graphics card.