After a couple of weeks of slow progress, I actually have a couple of images to post. This first image shows me preparing to install one of the cross pipes on the case. You can see that two are already tacked in place.

 Figuring out how to do this with the limited tools and work space that I have took a bit of time. I determined that the wood template idea that I used when creating the sides wasn't going to work for this. After a few failed ideas, I ended up installing the first cross pipe and building the rest to match. I built a small spacer that I could clamp between the sides to keep the distance correct then tacked each cross pipe in place.

 The next two images show the case with all the round cross pipes welded in place. I still have some finishing to do on the welds before they are done, but it is mostly cosmetic

 You may notice the the bottom rear of the case doesn't have a cross pipe installed. This will be where the Power Supply bracket is installed which is being built from 3/4" x 3/4" x 1/8" angle iron.