A little bit of soldering was all it took for a fix. The power supply got similar treatment as in ATX case, but I didn't feel like removing it and taking it apart, so slots were just snipped and bent up in place. All the power cables were tied with twist ties to reduce air resistance. Ribbon cables were separated into bands of 5 connectors, stacked and also secured with twist ties. My earlier attempts at cable wrapping were with continuous cotton cord.
Twist ties are easier.
Case modifications in front included removing a support to make room for an intake fan and port for CPU duct. Cardboard was used to enclosed intake area. Foam is attached to case front to seal area. Bottom of plastic face opened up to allow airflow to fan and duct. Since this picture was taken I hot glued caps from 2 liter soda bottles over the feet to make computer sit higher from surface.