New plans appear on the horizon - at least for "actual" SFF. Probably going for a custom case using MakerBeam. Tower-like, either open frame or with some clever air ducts / routing. Approx 18L. The Meshroom S is all cool n stuff, but I had such a hard time building in its predecessor, the Meshilicious, just with SFX parts, that building a workstation mATX system feels .. well, doable, but like a really really painful thing. And if you need to go much more custom than "intended", then things get really complicated or "3d printer only" ASAP.
That might mean I'm going to transfer the NAS system to the Meshroom S. Storage issues remain the same, too. 2x 4 TB HDD + 2x 2 TB NVMe SSD, both as RAID1, properly positioning the hard drives is a hassle no matter if its the SAMA IM01 or the Meshroom S.
Now, for the current MFF situation, I'm hopefully gonna manage to get the SFX PSU + the GPU installed soon, which is also gonna be used to clean up after about 8 months, re-arrange the fans, maybe add a few more, including to the back of the case and covering the back with a bit of dust protection.
If lucky, I may be able to position the PSU rotated and "down", with just some rubber spacers, and either attaching it to the case using one or two thick L-type 90° angled brackets, or a SFX PSU cover + magnetic tape.
cu, w0lf.