I got a tap drill from home depot : Tap Drill and finally assembled the diagonal rods which took up significants amount of time because I was afraid they would split, one did, but just barely.
I didn't have an allen wrench long enough, so I used a bamboo skewere I had lying around, it worked perfectly.
Once attached to the effector
Then I assembled the frame (except for connecting the top piece, still waiting for my motors and vertical carriages:
Getting the nuts perfectly aligned nearly made me nuts!
My MK2A board is a too small to fit, so I need to get some larger cork insulation board.