This is my first fabrication project with my Everlast PowerPro 256. I needed a welding cart that would hold my welder, tank, water cooler, air dryer, and accessories. I'm pretty happy with the way it turned out. The top is not intended to be a welding table, but rather open work space for clamps and stuff. I have another rolling steel welding table for actual welding.
I started with some heavy aluminum C channel I had laying around for the base frame. Then added 1.25x1.25x.120 6061 aluminum tube for the upper framework. I cut it with my band saw, then milled the ends so they were perfectly square before fitting up and welding. I used .125 aluminum diamond plate for the shelves. The wheels/tires are Harbor Freight specials. It rolls real easy and smooth over my cracked garage floor.
The shelves were placed specifically to fit my equipment, and are not the same height. There is enough space next to my PowerPro 256 to put a nice little Mig welder someday! The 110v quad box outlet is placed low so the short cord on my air dryer would reach. There is 1 1/2" of breathing space between the air dryer and water cooler so they can circulate air easily, but they draw primarily through the ends and not the sides. The cable hooks on the sides are door bolt hooks (the kind you slide a 2x4 through to secure a door).
If it looks like it leans back toward the tank a little bit, it's because it does. The front wheels are just a little too tall. It's not enough to cause any problems, and maybe someday I'll find some wheels that are 1/2" shorter, but for now it's fine.