Print in a strong material, place 30 standard m5 nuts or nylock nuts and glue the two halves together before press fitting or glueing into the bottom of a 3dprinted pubpad. Allows for bolting footholds down onto the pad from the top without removing the pad from your board.
The author remixed this model.
Took a negative of the space beneath the foothold bolt area and laid out m5 nut sockets