After removing the unused standoffs, which were shorting the board, the P6T fits nicely onto the tray. This Asus board shipped with an insulated back panel:
One final feature that anyone building a PC can appreciate is Asus' QuickConnect feature. Connecting the front panel to the header pins on the board (e.g., power sw, reset, speaker, hdd LED) has always been difficult and only becomes more difficult as our eyesight and dexterity fade away with age. Asus ships this board with an labeled extender (shown below) that can be pre-attached to the front panel connectors then mounted into the header board. Thanks Asus!!