The main app I use is redshift, a 3D gpu rendering app. It doesn’t use SLI, just uses Leverages each card directly using CUDA stuffs.I'm right there with you, athough I would definitely say that there actually are a few good options out there; I just want that little bit more.
Dual single slot, huh? That should be very possible in this case except for the fact that the graphics card is slotted straight into the motherboard. Thinking about it though... admittedly I'm not an expert on PCIe bifurcation, but if there's a really flexible low profile cable... you could use the bottom two slots of the 3 slots allotted for the GPU, and make it work that way? When I post the gut arrangement of the design, take a look and see if that could be a thing.
I'm not a fan of SLI/Crossfire, but it would be pretty sweet to run that in a build like this! I'll do what I can to help that happen.
Thanks man, I’ll be keeping an eye, good luck for both our sakes