Excellent job! Regarding your integration with the 1099's, don't forget that you will have to delay the subwoofers relative to the main speakers. You will likely have to set the phase in the software to 180 degrees.
Ask your doctor if DIY is right for you. Side effects of DIY may include anxiety, elevated blood pressure, lightheadedness, rapid heartbeat, skeletal muscle flaccidity, euphoria, psychological dependence, insomnia, confusion, blurred vision, implusivity, uncontrolled or repeated movements.