Electrical conduit works good for fleshing out your plans on the truck. I didn't do the typical bend-out-above-the-bed like most bars because of cost reasons and strength concerns. Mine was made to be a real rollbar so I wanted to avoid weak points. I'm sure you've seen my photos, but for anyone that hasn't, I put the bar right through the bed floor and this is how I tied the front into the frame. the bar comes down and is welded to a cut cection of 2x6 rectangle tube which is welded to a broad 1/4" plate (to spread out the forces on the sheetmetal) and that plate is welded to my frame. I even nipped off the corners of the plate so as to not create a stress point.
And this is the rear. Same sort of deal, but he plate isn't welded to the frame, rather it is bolted through the frame with a 3/4" bolt. Some day I plan to add the same size bolt to the front.
The one thing I regret not doing was adding a diagonal to the main hoop right away. I had planed on doing it later and only after the bar was in did I realize how hard it'll be. :( Oh well. I'll figure something out.