WORK IN PROGRESS
I just made this base in order to get the ball rolling for others to take and remix some idea including myself eventually. Its just a piece that fits in the bottom of the Echo Auto mounting cut out. It has spots to insert two 12MM x 2MM magnets.
Printing it vertically is best. Suggest a brim to help more surface area on the bed plate since its fairly thin. Again i'll be expanding on this eventually.