You can get Fusion360 free with a startup license (at least you could when I signed up a few years ago), as long as you aren't making more than x amount of money on whatever you're doing.
If you're an EAA member, they have a free Solidworks student license that comes with membership.
https://www.eaa.org/eaa/news-and-pu...07-25-2016-new-member-benefit-from-solidworks
https://www.eaa.org/eaa/eaa-membership/eaa-member-benefits/solidworks-resource-center
Fusion 360 is what I know about, so here's a list of features that might be useful:
Sheet metal tool - if you make your skins sheet metal, you can supposedly unfold them and then export the shapes. (I've never done this; maybe someone who has can give more detail)
Sketches - You can export a sketch (so, a 2d drawing on one of the work planes) in Fusion to a .dxf file, which you could import into Illustrator or Inkscape to make plans.
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Hope this is helpful!