It took Paul and I two days to replace the left side torque box. About a half a day was spent digging out three broken bolts...the two body bolts in the trunk and one that holds the bumper bracket to the frame rail. We also lost some time experimenting with how high to raise the body to insert the main box. Without broken bolts and with the knowledge we gained from the left side, the right side (if it was needed) would have probably taken 8-10 hours.
Paul's mechanical experience...even though he had never done a torque box...was invaluable.
In addition, it would be very difficult to perform this operation without a lift, air tools, the porta-power, a collection of spare nuts and bolts, and two full tool chests.
Bottom line is...I'm glad I purchased this Avanti and happy with the outcome of the torque box job. I gained some experience, had a great time working with Paul, and now have an Avanti that I am confident is solid all the way around.