For the tongue and groove, it is a good idea but I would not use foam since as soon as squeezed it is going to crush a bit and your alignement will be very bad ... good pieces of wood planed to the same thickness as the foam will have a very accurate thickness and used on both 4x8 sides should make thickness difference very minimal between panels. Make those pieces longer than 4 ft and you can clamp them together on the side of the table (or notch the foam to insert a clamp inside the table). The pieces should not touch when clamped so the mdf faces are forced together with minimal gap.

Panels like this are so rigid that you do not need steel frames, but you do need adjustable legs on both sides at each panels intersection to adjust height and compensate for uneven floor.

I would put them in a vacuum bag so good constant pressure is applied  for glueing. You will also need to spread the glue evenly so no high or low spots are created (use v notched trowel to spread carpet glue).

I would also let the panel rest on a very flat surface with a couple of flat mdf sheet over it when vacuum bagged and drying otherwise it could have a bend or twist in them. 

Take care on how you store your mdf sheets, I have sheets that now have a good permanent curve in them because they were stored against a wall at too high angle. You can bend them back straight but it is a added hassle.

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