What you can see here is the actual RH Fender support brace this is attached to the 2 vertical pieces of metal
The rear one being much higher then the small front on, these are welded to the two inner metal tubes
This is the LH side, you may notice the Fender support brace is longer on this side
So that it continues the complete length of the Fender lip, the white cardboard you
see is how the inner fender area will look.
This will also be done on the RH side