Today I headed out to the Alameda warehouse hoping to make some major progress on rack #3. First I had to cut an 81 degree angle in the verticle supports. 
Using my trusty angle grinder I flew through this task in about 30 minutes. Tacking them to the frame using a MIG welder took another 25 because I had to go back and forth positioning them plumb, square, and angled outward so that the widest point was exactly 61 inches. The angles I cut guided me, but I had to tweak them into perfection.
After tacking the two six foot lengths of angle iron that would be bolted to the bed of the truck I was ready to flip it right side right. Now I could add the triangle structure that makes these racks so tough.
In the four hours I spent welding today I basically framed out the whole rack. I still need to add some hardware, tie-down hooks and a removable rear lateral, prime, paint, and install the thing, but I'd say I did a lot today. Now I'm off to the bars: Jupiter on Shattuck in this weather...heaven.