Reverse 4 links are bad. This is an exaggeration but it shows why they are compared to a forward 4 link.
Forward 4 link:
Reverse 4 link:
You can fit make a crossmember with a much larger notch than that without having to cut the bedfloor. We put this one in my buddys truck and it goes to just below the bedfloor just to give you an idea of how big you can go. But keep up the work man it looks like your making real good progress on this thing.