Yes, it's that one (Rosewill 4U RSV-L4500), still haven't arrived today.

Looking forward to your results and an offer.

Thank you very much.

If you need this info: I am using one GPU on the mainboard, and 6 in the front (2x triple slot and 4x dual slot). Anyways, your approach with nuts and screws instead of pre-drilled holes for each gpu bracket would give me the flexibility for now and future changes of the hardware.