I created this Tech Tree for DA ahwile back and I figured I may as well post it just in case it was of use to anyone.
The only thing about it that's vaguely useful is that it fits on two 8-1/2" x 11" sheets of paper. I print them out and put them in a plastic sheet protector and have the entire DA Tech Tree in a readable and compact format. It beats having to reference a poster.
Now if I could ever beat myself into playing again but that's a different story. Who knows, I hope to retire in another 4 years, perhaps then.
For what it's worth.
The external link is to a post at TOE where I have the file as a pdf attachment.
Here's how they look as jpegs.