Have you had the fender and liner test fitted in place yet?
You may be surprised what's all going to keep the liner from fitting,I see a few things that may need to be reworked/routed for the liner to fit.
I have been test fitting the inner fenders as I’ve been working on this. You are right, it’s tighter than you think. I’ve had to make a few tweaks, but I think what I have will work.
I am going to grab the fender and do a full mock up. Would be worth checking at this point.