Any ideas on 48x30 Mk2 bench design?

Welcome to the forum @pkillur. I built a system to mount boards vertically in my table for doing dovetail and box joints. I’m really glad I did. If that interests you, I have some pictures of my setup in this post. You can see the vertical mounted board in the last picture.

If this interests you and you need more info I can post some more pics with the underside for my clamping system which is just a 2x4 with bolts at either end to clamp the wood.