For the 45 Bay, there is no room for motherboard, you will need 2 SFF-8088 SAS cables to be connected to access all the drives.
We do have a 24 Bay with motherboard if you are interested:
...
- Supermicro SAS846TQ Chassis
- Supericro H8DME-2 Server Motherboard with Dual AMD Opteron 2.1Ghz Processors
- 32 GB Server Memory
- Supermicro SAS846TQ Mounting Rails
- 3x Supermicro 8 Ports 64 Bit PCI-X Interface SATA Controller Card AOC-SAT2-MV8
- 1x SIM1U+ with AOC-USB2RJ45 IPMI Adapter
- 1x 4GB ATP SATA DOM Horizontal FLash SATA-SSD Module w/ FREENAS v11
- 2x Redundant Power Supply
- 2x Power Cord Cables
And what is the price you are asking for this?