Thats the cage with a few mods.
I have added a bar across the front to brace the A post legs - onto this several upturned M6 bolts were welded to use as earthing points for the electrics behind the dash

Its braced through to the front turrets. A rear bracing bar was added to the B legs low down behind the seats. The rear back stays were moved off the cars inner wings (as these are not strong points) and joined onto the rear diagonal and added strut brace. All cage "feet" or legs are built up onto strong boxes welded to the chassis rail sections as again the floor isnt that strong.
A little over the top for a track car, but may give you some ideas ??