Be easy enough to glass a "pad" of ply to the floor so the battery box strap screws only go into the pad, with a bit of sealer on the screws it will last forever. How about some vertical rod storage, much better to fit more rods in than laying down. Hingeing the T top is going to be painful unless as advised, it does hinge from the floor, even then you need to know how long the roof is, because when folded, the roof is then vertical.