Table extension thoughts...

I would use joist hangers to attach 2x4s for the frame, plywood goes on top. JohnA

These are complete tables made of wood with legs? Why are you not going with 2- 2' x 8' extensions to make a 6' x 16'? That plan won't fit if you only add 12' to the front, but maybe that was a typo.

Either way, I would make two frames of the size of the addition you want and then before you screw down the top, screw them to the apron (face) of the existing table at a height that will make them flush when you add the top. Much easier than attaching them with the top on. You will have to add more legs to the front of this table.

Yep I can hardly understand my own question. Yes the tables are complete with legs. I just want to add an additional 2 foot extension running for 6 ft followed by a 2 x4 ft indent (access area) followed by another 2 ft extension running for the remaining 6ft.Your advice is either way to frame them up and add legs. Thanks.....