Actually its pretty straight forward. Once you have everything 3D printed, look at the uploaded images and video to see what fits where.

1. The two towers that hold two injections, will fit in the base perfectly if printed vertically instead of laying flat (horizontal, one might prefer to do this, in order to remove supports) on the printer base. If printed horizontally, it might need some hot glue to be held together with the base.
2. I got those injections and tubing from ebay, there are many sellers.
3. The only critical part is how the injections are connected to each other through the tubing, its a simple hydraulic/pneumatic principle, that I don't thing need explanation. I am sure everyone can figure that out. And I just want to point out the importance of moving the two pair of injections together in sync. It works perfectly fine with/without a fluid.
4. The horizontal lift handles are hot glued onto the tops of two vertical injections. (Would like to change this, if I get time)
5. The control combiner that holds the two horizontal injections together while pushing/pulling might also need some hot glue.
6. Super glue lift-part1 and lift-part2