twisted spar

[ScramIt@aol.com]

Hi all, I'm working on placing the W18 plates. The two outboard plates are 
fine but the inboard (closest to the wing root) sits away from the rib at 
it's top. This is because the rib is twisted. The top of the rib has been 
setup square with the main wing spar and the bottom is square with the 
trailing edge. It looks as if someone took care to do this (it's marked out 
with marker) is this right? 

Thanks,
SteveD