Haven't done much lately. But today since I had to work I used the nice weather to figure out a solution to mounting the air tank. I've got it stuffed behind the winch below the radiator between the framerails.
I used a different technique to attach the brackets to the frame that one of my techs at work suggested. Sorry, no pics as my phone died while was out working on it. But the gist of the idea is since I couldn't get in between the upper and lower lip of the framerail to drill holes for the cross brackets I pinched the brackets to the upper lip of the framerail. Basically, the rearmost bracket is 1" wide 1/8th" flatstock as it's directly below the core support. A pair of holes are drilled just off the side of the framerail. A 4" chunk of 1/8th" thick 1" wide angle iron has matching holes drilled to the flat stock on each side. Bolts are dropped in from the top down and the angle iron chunks are installed with the bolts and clamp the underside of the upper frame rail lip. So with the pair of bolts clamping down the angle iron to the frame rail the bracket is locked in place and has zero movement. The front bracket is set up similar, but I used a full width section of 3/4" angle iron to bridge the rails.
Holes then got drilled in the cross brackets to mate up to the air tank. I bolted it in to the brackets after locking the rear cross bracket first and leaving the front loose to line up to the air tank mounts. Once I got the tank bolted up to the front bracket I locked it's position down to the frame on each side. Overall the setup is very solid. I'm going to drive it and recheck to make sure it's not coming loose.
Next up, mounting the air compressor. Running the wiring and hoses.