Matt (the product creator) has been under the weather,but he plans to answer questions as soon as he is feeling better.There have been few more forums requesting more info to.
I do know Underwriters Lab hung a 60 lb weight on a nailed up terminal box with romex connected and it remained intact .The System will be listed in NEC but that will take time,I understand is not released very often.

Andi thanks for tha accu-driller tip

DonT wire nuts, wire-easy.com