I completed the SB 16-12-16 last weekend and here is my recommendations.
Drill the 3/4 to 1" hole as documented in the SB, do not drill the bottom holes, "not necessary". I would then drill 4 small 3/8 holes above the upper nut locations, these are for viewing. You will need to make special wrenches. Weld a reduced height 7/16 socket on to a rod about 18", this will help you pick up the 2 lower outer nut/bolts. You will also need to make a left and right 90 degree tool to attach the upper nuts. Fish these through the 1" holes You may need to make two sets of varied length. Do not try to add washers to the inside nuts, the length of the bolts will not allow you to add these washers and still have 1 1/2 thread showing passed the nut. I will attach photos after I figure out how to. Good luck, this was not an easy task