This is a pretty cool chord / scale generator. You can specify the tuning and number of strings, and it
includes all of the normal modes and scales, including some exotic ones. It comes out like this:
http://www.studybass.com/tools/chord-scale-note-printer/
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Under "Tuning Notes" enter "A,E,A" (with commas, no quotes)
Click "Set"
Go to "Scale" or "Chord" and pick a root and whatever scale or chord you want.
BTW, it doesn't show you a single chord fingering or scale pattern, it just shows you where all the notes are located so you can figure out your own voicing / fingering.
I'm planning to build something like the "canotto" with some 1/8" ply I have in the shed:
http://liutaiomottola.com/instruments/canotto.htm
Feel free to beat me to it!