Wow! Nice skills you have there!
Ok, I have a stupid question. I don't know squat about suspension design, but all of the panhards I've seen are a lot longer than the one on your front axle. Any particular reason you deviated so much there from "normal"?
Basic geometry rationale, is that the shorter you make a diagonal, the more it alters the axle path as you move the assembly up and down....but putting it all the way to the wheel means you have to clear the frame, right?
Space restrictions is the best answer as to why any longer and I would have hit my steering box or the coil spring, putting it in front of or behind of the axle would have interfered with steering linkage or oil pan. When it comes to geometry if you understand that following a simple ratio of length vs angle and keeping the ratio true for both at ride height then bump steer will be minimal as long as the panhard bar is fairly close to parallel to the axle. So if the panhard bar and drag linkage are same length then you want them to be parallel or degree ratio of 1:1. If the drag linkage is say 60"and the panhard bar is 40" then you have 4:6 or of course simplified 2:3, so if the panhard bar is at 10 degrees then the drag linkage should be at 15 degrees. Again if the drag linkage is 50"and the panhard bar is 25" then your 1:2 ratio, thus a 5 degrees at panhard = 10 degrees at drag linkage. That will keep the curve of travel as linear as possible through the suspension cycle. One exception to the rule would be if your panhard bar was half the length like mine and parallel to the ground you wanna put a little positive degree to the drag linkage.