Hi there,
Not quite what you are asking, but the Silverstone Raven cases (like the midi-size
Raven 3) have the configuration so the motherboard is orientated 90 degrees from the usual setup - so the PCIE slots and motherboard outputs face towards the top of the case - which is a rather clever configuration IMHO since hot air rises from the powerful components (CPU heatsink, GPUs) and this flow isn't impeded by any other components - just gently encouraged with quiet fans.
These cases take ATX and mini-ATX motherboards, and from personal experience building my sisters PC in a Raven 2E these cases are REALLY nice. They are well made, look cool, pretty simple to build in, are cooled very effectively (due to the design which works with the rising hot air) and run very quietly (due to the use of large, slow-running fans).