I'm also working on an 80/20 rig, as the co' I was planning to purchase their first attempt has been MIA for too long on too many occasions since January, sadly.
Once completed and tested for ridigity, I will post the pictures and parts list here. I likely won't immediately mock up a screens mount because I'm using oculus, but it should serve as a great base to start from for anyone who is using osw and heusinkveld/hpp type pedals and require the stiffness.
Cheers