Your husband is what we call 'nuking it.' I have a son in the nuclear propulsion dept. on theUSS Ronald Reagan, and when he was in nuke school, we found that they have a tendency to overthink things.
My husband now, a change from earlier, takes my suggestions as that, suggestions.
He put brackets on the underside of the big board, so it would go on top of the regular board just so, and it is kind of heavy, but gets moved rarely, so it's not much of an issue
I remember him picking a certain kind of board because he didn't want it to warp from the moisture, the brackets help