Hey Jim, got a couple of pics to help answer your questions. The first from the lower right corner of the Saladin blueprints.
The second is from the Enterprise Bridge blueprints. It doesn't give exact dimensions but it has a scale so maybe it will get you in the ballpark.
By the way, I Photoshopped an Ajax bridge plaque but it's on my computer that 's now in storage. I'd could dig it out if you'd like me to send it to you.