This floor setup is ILLEGAL
The problem is, as LegendaryM has said, if you intersect longitudinally
or laterally, there must be one continuous line.
I will now prove that with this floor, this is definitely not the case.
The floor has a similar shape to yours. The red line shows an intersection on a longitudinal line. There are two lines, not one continous line, rendering the floor illegal.
As legendaryM said, this was legal back in 2009, when the Mclaren had it, but was banned in 2011 as part of the clampdown on DDD's.