Need 4x R9 290 Open Air Case Help

I am in the process of upgrading an old mining rig into a gaming rig. Currently the cards are Frankensteind onto some dowels suspended over a plastic crate:

The hard to fit into a normal case parts are:

4x SAPPHIRE TRI-X OC 100362-2SR Radeon R9 290 4GB 512-bit GDDR5 PCI Express 3.0

Rosewill HERCULES-1600S, 1600W Modular Power Supply, Continuous @ 50 degree C, 80 PLUS GOLD Certified, SLI & CrossFire ..

My question is whether anyone knows of a modular open air tech/test type station that would work as the ones I've found expect you to be able to fit the gpu's on the motherboard.

Any help would be appreciated.

I appreciate your reply and willingness to help. The nice thing about the TRI-X version is that it has three fans on each card. It seemed to stay at a good temp even while running near 100℅.

As for the cases, it seems that all the open air tech stations expect you to be able to attach the card directly to the motherboard.