Special construction floor question

[Vonflame]

Is it possible to run a floor of steel plate construction affixed to the bottom of the frame rail.  I have seen a couple of older cars do this but I am wondering if it is currently an acceptable practice. Rule 3.G says that you can have a floor attached no lower than the frame rail.  I know that you can plate the top of a roll cage to gain an amount of space as long as your helmet cannot exit the tube structure within that plated space. I just wonder if you could do that same thing to the floor to gain some more seat room/head room. In all I guess I?m looking for some clarification on how you would go about making this kind of floor.

[jacksoni]

Do you mean a car in the Special Construction category, or "specially constructing" a floor in  production based car. Difference being in a  production based car you may build something that would be considered a step pan or belly pan which are only legal in certain circumstances.

[SPARKY]

That is a very grey area that I encountered in the construction of my Lakester that started a minor dust up,

Do you have rect. or round frame rails?

Wall thickness of frame member and thickness of plate?

I was using 11 guage which is .091 thickness 

It decided that I was to cut the tacks and bevel the edges so that a straight edge could be run across frame rails when using plate that was the same or less than thickness of frame member

I was working with officials during construction and not something I showed up with at first inspection and got it "signed off on in advance"

[Vonflame]

This is on the lakester build using 1 5/8 round tube the plate would be the same thickness as the tube used in the car I?ll see if I can find a photo of the idea that I have from a car I looked at a year or so ago

[Vonflame]

This was a lay down car that I looked at a while back but figured out my engine package would not fit well in it but you can see that the car has a dropped floor that is made of plate to gain some butt room the area To the rear of the car where the tubes are is where all the seatbelts and seat pan fit for your back

[jimmy six]

I inspected many race vehicles over the years where the lower body panels attached to the bottom of the frame rails either as step pans or belly pans. Materials were optional but everyone had additional panels on top of the panel in case they were ripped away in an incident which was there purpose. Your ?butt? would have never been allowed to sit on the step or belly pan. At minimum it must be in a seat or on very well secured secondary flooring with a support that did not allow you to slide forward.
Many were attached to tabs welded to the frame rails and cross members just fractions of an inch above the lower panel meeting the rules. Some of the fasteners were ingenious but all met the rules to have the drivers in a second skin so to speak. The same applies to the sides today that no limb can get through supports which also was a rule change after I started inspection. Most were done with duez fasteners..