I wouldn't cut any of the floor boards away without at least a roll bar tied into the the rear shock towers and floor board, a full cage would be even better but then you are adding weight. In my mind cutting the floor boards would be a safety and stiffness issue but I've never done it.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.