What Mike and Susan built is really nice. Very clean visually. I did something like that but was not happy with the bridge's durability.
My experience with the Atlas Pratt bridge when used as a lift bridge has been disappointing. It is a well done economical offering, however I found it rather fragile.
Several years ago I thought to set it on a lift out panel with glued down approach tracks. A little flat black on the subframe and it was good to go. Photos upon request.Not a rivet counters project but dependable.
I have since done it on several others with success. The subframe also serves as a linear mount for wires without going down to the floor or over head.
What i really need to do is to use the actuator Like Mike shows to make a self lifting bridge. thanks for the photos and encouragement!