One thing I learned about gluing up large panels is to used 2"PVC pipe. I learned this from MTM Wood. He is from Russia and he has a custom cutting board company. All his glue ups are dead flat on the side that rest on the PVC. Now I have personally used this method and it works. It allows you to get clamps underneath the glue up and it can sit on PVC without sticking to it or leaving any black spots. The wood surface stays true as long as you have have squared up properly. Otherwise it the highest point of the wood will only touch. Whats nice is the glue clean up is fast and easy. Also your surface is ready for a 1 jointer pass. Just a FYI if you haven’t heard of this.
Next insted of bisquet why not spline it all the way down? Just a though. I did some research on companies that make tops. I saw a few that used toung and grove. I really like that but to accurately cut the toung I believe a shaper is needed. Well I don’t have that. I don’t want to have the face to face to have any surface to surface loss of contact by using the table saw for this method. Thats why I stated splines. You could alternate the splines every other board would be near the top then the other would be near the bottom. Use contrasting wood to have it highlighted on the end grain.
Jeff Vandenberg aka "Woodsconsin"