I fabed up a frame for my Porsche seats to mount in a 74 super.
Do a search, there are pics of it some where here.
I have mine made out of 1"/1" square tube and 1"/1" angle and 3/16 plate.
I have a box config whats made out of the angle, then the legs are made from the tubing, and the feet made from the plate.
It mounts in the original seat tracks, and tower aswell as bolts onto the floor pan (But all the weight in suported on the tracks) so there are 7 (yes 7) mounting points for each frame.
One thing i would NOT recomend is making a frame and bolting or welding it directly to the thin floor pan. unless you strengthen it some how, otherwise you might run the risk of having your seats rip out in a crash (no good) not the mention your seats will move around becuase of the thin metal :S(But this wont apply to you as your using the stock tracks to)
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