Ack . , I think you are right . I tried to Add the following to my original Post , but it would not take . If someone could mate the Rockwell Tools Base with a detachable thick Plywood Top , that would be a very neat set-up .One thing about portable benches, the good ones will be large enough to where your rear bag will not be falling off on the ground, and even more important, wide enough to where your elbow will have support. If your elbow is flopping in the breeze, so is your crosshair.
Twoflints
I used to shoot a lot of air rifles... mostly pest control from inside my house.. but for a field app. I would say what you have is darn near perfect..