kixs wrote on 2023-06-22, 16:11:ATX cases like these? […]
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ATX cases like these?

Yes, much harder now to locate any.
These three sets of ATX cases are awfully fanciful for my taste. 😀 Did artfully stated plain cases with floppy bay.
Well, I have suggestion for others having this same problem:
If anyone needs a mATX case with floppy bay, Get Dell Vostro 230, which can fit a full length GTX if one wishes, swap PSU if required but still perfect for AGP or PCIe motherboard, plenty power left or swap PSU, and swap out the board for another of your choosing, rewire buttons LEDs.
For Vostro 260, to make room for long GPU card, Relocate the hard drive cage upwards to right under the floppy cage but this takes work with tools and some material, the chassis is exactly same as all of the optiplex line that uses these like 990, 7010, 9010 eg and does have floppy bay. All these recommended models has snap out rear i/o panel.
There are plenty of mATX from other models including Dell. For example: Vostro 470, XPS 8500 motherboard are designed to take a 2 slot wide GPU without blocked by anything on the motherboard. Still need to jumper the front panel header pins to keep in correct mode. Details are out there for this and power and LED assembly out there as well. Just watch for one with standard ATX power connector.
Alternatively; you don't mind rougher look, remove the Optiplex front panel and USB port with LEDs and relocate that or something safer place, install floppy there. Or cut a opening in the front panel for floppy. Change out the motherboard for another.
For no mods like these with optiplex, these are perfect for AGP cards and mATX motherboard with AGP slot. Longest video card one I know of still fits without relocating the hard drive cage. For this, I really like Optiplex 990 and similar models style and great cooling.
Workstation boards uses proprietary pinout for power supply, so watch out for these and use HP to ATX converter adapters. This rearranges pins and convert 5V to 12V standby power included. Did like that for low budget ivy bridge PC using Elitedesk 8300 motherboard in another ATX case, used a HP SFF heatsink, with nuts and nylon washers. Needed jumpers on front panel connectors. Didn't to use it as was sold to another guy who needed one few years back. HP Elitedesk 8200 (sandy bridge) and 8300 (ivy bridge with USB 3.0) boards are full ATX with ATX standard mounting holes.
Cheers,
Great Northern aka Canada.