Instructions
This is a DRAFT design, but it works VERY well so far. (at least for me)
I used 3mm acrylic material, it is actually a little too thin, so I mounted the two motors with a set of washers to pull them out a little and also wrapped a piece of tape around the center piece to make sure the filament would move smoothly.
To prevent the motors from pushing apart I glued the 4 layers on each side to a firm brick, this helped create a very firm mount.
The Dino is very rudimentary, only one piece of 3mm on each arm, I thought it would wobble, but it seems plenty firm.