I thought I was approaching this project wisely by paying a strutural engineer 350.00 to consult on the project. After he came to the house and saw the project in person he advised I could box in the trusses by gluing and screwing 5/8" plywood to both sides to stiffen them leaving holes for wires and a hvac duct. I even went ahead and got a building permit describing the project in detail with pictures. Now I understand I've created box girders and have compromised the trusses. The engineer who advised on the project will not return my calls. Below are photos. Any suggestions would be welcome.