I have a less portable wooden bench that I use on my range.
I always had problems with rounds rolling off the top until I put a 3/8 inch lip around the top edge. Also, I had some difficulty with my trigger side elbow sliding until I placed some THIN rubber backed doormat material from my local big box store on the top.
It looks like you are ready to use it in the field.
Like any of my projects, field use will dictate the personal mods that suit you.
I would die for your kind of shop.
montveil in the NC mountains
All persons present in uniform should render the military salute. Members of the armed forces and veterans who are present but not in uniform may render the military salute. All other persons present should face the flag and stand at attention with their right hand over the heart, or if applicable, remove their headdress with their right hand and hold it at the left shoulder, the hand being over the heart.