It appears to be a rushed, unfinished conversion. I'll wait for something better
There are some better ones out actually, there's a 2005 and 2006 F1 mod available. Somewhere on Nogrip. The only issue is that you will have to use the car filter because they get mixed with the FBMW class. They work reasonably well.
With alittle bit of editing you can get the 05 and 06 cars as a stand alone class.
I've prepared a patch to allow this, just awaiting permission to release it.