The ability to specify a unique directory for all Sweet Home 3D files should be available in the coming versions (it's portability subject in Sweet Home 3D roadmap).
But as you're on Linux, recovering your imported files is quite easy if you really created a backup of all the files of your home directory:
Search in your backup directories named ".eteks" and ".java/.userPrefs" at the root of your old home directory, and copy them in your new your new home directory (as directories starting with a dot might be hidden, double check if you don't see them).
Note also that you may export all your imported models in a SH3F portable file with a plugin.
Did I say already that I really LOVE SH3D ??
I'm glad to read that. Feel free to post images of your project in the Gallery forum if you want to.
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Emmanuel Puybaret, Sweet Home 3D creator
