I wanted to post an update. I ended up ordering 2 less T joints than I needed(will have them tomorrow) so I was unable to complete the top portion of my rig, which is fine as it only acts as a support for the next level of GPUs which I need more $ for anyway
The design:
Here's a pic of my rig as it is now:
You'll notice I've got a few zip ties in the pic. I still plan to use thumbscrews but I wanted to take more time on a scratch piece to better determine the size to drill. I'm working on cable management too, probably secure them around the top bar(seen in design) Also in the design I had a T slot
https://8020.net/shop/20-2020-black-fb.html which I was going to use in combination with 2 of these
https://8020.net/shop/13082.html on the bottom of each riser to easily slide & tighten them wherever needed but it's been nearly 2 weeks & 80/20 still hasn't even shipped my order. So for now like others my risers are just sitting there. I did line up the holes as you can see so I could simply screw them into the bar(& might still) but for now while I was easily able to pickup the whole thing & take it upstairs, I'm far from my goal of every part being 100% secure even upside down.
Lastly I sent a friend list of all the parts I ordered pre cut to exact lengths, aside from the bottom board from Home Depot & standoffs used to mount the motherboard it
all came to $67 That's far from the $250 a similar frame goes for. So assuming all goes well & he's able to simply push all the parts together, then drill a few holes. I'll soon be posting a how to guide/build manual & possibly see about getting a bulk price on parts so I can sell a few of these for even less.
$100 for the whole thing, including base board, thumbscrews, riser mounts, MB standoffs & gummies. Not bad for a 7 GPU rack right? & to add 7 more cards(13 total is my goal) only takes 4 more parts at around $15.
For now if anyone is interested in this design & parts PM me. 80/20 does have some of the parts but at 2x the price & I'll never order from them again. I have to jump through some hoops to get these parts at that price but wouldn't mind placing a few orders with them & just telling them to ship to somewhere else. Cheers!