Turns out I`m building from scratch, I figure trying to incorporate pieces from the stock F150 mounts would be too iffy.
So after double checking that everything is sitting exactly as it will when done, lift-wise, I was able to double check the drop of my brackets which are 3 inches from bracket to center of hole.
When in doubt over-engineer! The bushings need a 1 &1/2 inch diameter hole through metal 3/4 of an inch thick, so my bracketry you can see is all 3/4 of an inch thick. once I am satisfied that it is lined up exactly how I want it, by measuring everything, everywhere, I will tack it up, then trim down some of it and reinforce it. I`ll post a bunch of measurements for reference after I`m sure of the fit up but for now here is some pics of my progress:
-edit- the dowels can be seen in the third pic. The dowel furthest back (rearward) actually goes into the hole that the front part of the stock T-case skidplate bolted to originally, I started by marking where that hole was on the plate, and calculated the second hole from there.