The instrument panel holds much more than the avionics. All sorts of switches, warning lights, heater vents, have to be fitted. Also, behind the panel we designed and constructed aluminum angle supports to stabilize the rear of the avionics boxes. In addition to wiring static pressure tubing, manifold pressure tubing, defrost and defog CAT ducting, and much more had to be designed, fabricated, and installed. It's been a long row to hoe!