cj737 wrote:Those braces don't need all sides welded. A closed top and 1 vertical is ALL YOU'LL EVER NEED. Even then, 1" stitches would be more than ample.
You know, it's funny. I kinda had an instinctual notion that this was the case. However no practical experience to support the contention. Therefore when I read this it was validation of that sixth sense that has been with me during this build and even prior. So thank you for that CJ, I appreciate the feedback and learning point.
That said, I had these left over from the gantry project:

- storage rack 42.jpg (49.44 KiB) Viewed 3870 times
They are 1/4" plate and had some nasty long edges. So I took the angle grinder to them, careful to create a bevel while I was at it. Then tack welded them into position:

- storage rack 43.jpg (228.63 KiB) Viewed 3870 times
This is way-overkill I realize. However these little critters would have merely found their way into the metal recycling bin at some point, so I decided to put them to use instead. The entire point of saving them way back when was to repurpose them somehow on a future project. And that project turned out to be the storage rack. I mean what the heck, right?
Fellas, I had another rough go of it tonight. I was running the usual 3/32" 7018 in the amperage range that I've discovered works for this metal thickness. I didn't seem nor try to do anything differently than normal, but gheez... I stuck the rod more times than I care to remember. My electrode holder (aka "stinger") is old and won't hold the rod in a secure position any longer, but I was hoping to make it last through this project prior to swapping in the new one. 'Not sure that this was a factor, but it was a fact. I persisted, didn't give up, didn't give in and eventually I got there but boy ... just serves to remind me how much of the physical muscle memory you can lose when you step away from stick welding for a while. During the gantry stuff I rarely stuck a rod, though it did happen. Oh well, as Jody said in one of his videos "...that's why they call it stick welding."
Anyway thanks. This is as far as I would make it tonight CJ; I didn't get around to welding in any of the angle iron. Too much real-life work this afternoon and then family duties precluded that endeavor. Seeing as how I am planning the cut of the moon roof hole this weekend, I'll defer the installation of these supports until after that point and when I install the middle legs. I'm open to feedback, but it seems to me that the structure as it stands is easily strong enough to support my too-large-in-the-middle self and the equipment, certainly for the limited time that all that kruft will be up there.

The quick test I did the other day didn't seem to indicate any sag and it felt quite sturdy while I (and the son) were on top of it moving around...
Thanks again.