I used these below to mount them to the 80/20. Sorry, other than what I posted above in this thread there is no additional thread for the lights, but happy to try an answer questions. The difficult ones I will defer you to the master sensei @Reefer Reboot who made the whole designHow did you mount this kessils to 8020? Do you have a different thread for the light build? I am just beginning to design something. I already have kessils with stand mount but I am thinking of adding 2 AI blades to supplement kessils and mount all of them on a rectangle T slot frame and hang it from roof.
MECCANIXITY Mic Stand Adapter 1/4 Female x M5 Male Camera Screw Thread Adapter for Microphone Tripod Stand Black 2 Pack https://a.co/d/7Xtwu2k
Koolehaoda Mini Ballhead Camera Tripod Ball Head Mount with 1/4" to1/4 Screw Connector https://a.co/d/itb5Dd1