TRY THIS OUT!  It lets you do modelling and stress & thermal analysis.  And it's FREE for hobbyists!

    http://www.design-engineering.com/autodesk-updates-fusion-360-136974/
    https://www.google.com/search?q=fusion360+modeling&tbm=isch
    http://www.autodesk.com/products/fusion-360/overview


But Linux isn't supported.  :(  And it doesn't work at all in WINE either.

        https://appdb.winehq.org/objectManager.php?sClass=version&iId=33392