Not my Idea but thanks. On occasion I have a visitor that shoots weird and uses their left hand to do stuff...lol.
Of course the dimensions can be made bigger to suit anyone's needs but I wouldn't go any smaller. Depending on what you use to support your gun. If you're using a bag then smaller would be ok but if you were to use a MTM plastic shooting rest like I have, going smaller would not be good as those are quite large but some of the other shooting rest fit great on this size. You want to have a bit of room to play with so you can move the rest around on the bench to suit your shooting position.