Full build instruction here:

https://docs.google.com/document/d/1POd5k3NOQLyC4SDClqM-32kKq3NVj4JdU-bsBIcl7P4/edit?usp=sharing

Build Payload MPDB:

1)  3D printed parts needed

• 1x MPDB 1a
• 1x MPDB 1b
• 1x MPDB 2

1) Cut Material:

• Cut 1" tubing to 212mm
• Cut 3/8" tubing to 130mm
• Cut 3/8" tubing to 30mm

2) Construct

• Take 30 mm section of 3/8" tubing and place it into the center hole in the top of part MPDB 1a.

• Take part MPDB 1b and place the bottom onto the 30mm section of 3/8" tubing and press part MPDB 1a and 1b together.
  

• Take the 130mm section of 3/8" tubing and place it into the center hole of the top of MPDB 1b.
  

• Take the section of 1" tubing and place it into the outside ring of part MPDB 1b (put the roughest cut end of the pipe into part MPDB 1b).
  

• Put part MPDB 2 on the top of the 1" tubing, constructed above, alining the 3/8" tubing with center hole in part MPDB 2.
  

• Press together until 1" tubing hits the first rig on part MPDB .