Thanks! I really appreciate your help.
CaseLabs makes the best cases but their site navigation sucks beyond all reason.
I really thought I'd checked every single page there, but obviously I missed (at least) one.

FYI: the search function works pretty well - for example "adapter" would have brought up the 3.5" bay adapter at the top of the list. I'm hoping for a major overhaul sometime next year 
6CORE
(13 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| AMD 1090T | Asus Crosshair IV | Quadro VCQ 4000 | 16 GB 1333 DDR3 - Corsair |
| Hard Drive | Optical Drive | OS | Monitor |
| C300 128 GB x 2 (RAID 0) Boot WD 2TB x 4 (RAID 10) | LG Bluray Writer | Win 7 Ultimate - 64 bit | Dell U3011 - 30" IPS |
| Power | Case | ||
| Corsair AX750 | CaseLabs MAGNUM-M8 | ||
| View all | |||
6CORE
(13 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| AMD 1090T | Asus Crosshair IV | Quadro VCQ 4000 | 16 GB 1333 DDR3 - Corsair |
| Hard Drive | Optical Drive | OS | Monitor |
| C300 128 GB x 2 (RAID 0) Boot WD 2TB x 4 (RAID 10) | LG Bluray Writer | Win 7 Ultimate - 64 bit | Dell U3011 - 30" IPS |
| Power | Case | ||
| Corsair AX750 | CaseLabs MAGNUM-M8 | ||
| View all | |||

Rig №1
(8 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i5-3570k @ 4500mhz, 1.31v | Asrock Z77 Extreme4 | Gigabyte 7950 Windforce | 16GB Corsair XMS3 |
| Cooling | OS | Power | Case |
| Noctua NH-D14 | Windows 7 64-bit Home Premium | Corsair TX750m | CM HAF 932 Advanced |
| View all | |||
Rig №1
(8 items) |
| CPU | Motherboard | Graphics | RAM |
|---|---|---|---|
| i5-3570k @ 4500mhz, 1.31v | Asrock Z77 Extreme4 | Gigabyte 7950 Windforce | 16GB Corsair XMS3 |
| Cooling | OS | Power | Case |
| Noctua NH-D14 | Windows 7 64-bit Home Premium | Corsair TX750m | CM HAF 932 Advanced |
| View all | |||