On the 67-72 board, Scott's Hot Rods shows how they raised the fender lips. It might take a couple fenders worth of material, but "should" be easier than hammering a completely new fender lip. It's on pages 8-10, Goodguys 2015 Giveaway C 10 by Scott's Hotrods.
Hope this helps!
Found it.
Yep, insane talent in that thread.

I don't think their fender mod technique is going to work for this build though. I stole one of their images to study it and this is what I think is going on.....
The upper part of the curve is unchanged as you can see in this photo. There are no cut-lines or missing black primer. Section "A", "C" and "D" were originally all attached to each other on the original fender and were cut off as the first step of this mod.
Section "A" was raised a few inches and then tack welded to the fender....then the transition curve "C" was too high, so it was cut and dropped down to match the side body style line, leaving a gap "B" that was filled in with donor metal from another fender. Section "E" appears to be a lateral cut that was made to allow the truck to sit lower to the ground (not a priority on THIS build!

)....and finally Section "D" was dropped down so that it would continue the newly developed fenderlip shape that gives them a much wider opening near the bottom of the fender. It also appears that they may have added a small strip of metal between "C" & "D" to help extend that fenderlip area between the two original sections when they were cut apart from each other.
Ultimately, the end result gives them a TALLER opening and a wider opening AT THE BOTTOM... but I'm not sure that it would really work right for me. One of the other tricks that the low-riding pickups use is that they severely narrow the front end to get the tires WAAAAY inboard... this helps avoid a lot of the interferences with the fender as the tire sweeps in and out for hard turns. In those situations the complete tire is still underneath the fenderlip and doesn't really ever stick out beyond the fender.
For this "MAW" build, as the photos today show.... the tire sticks out a LOT during turning and articulation. I need to open up the fenderwell a lot further up each side of the curve than this example does... and that means that the curve itself has to be modified or it's going to end up with a bunch of weird "glitches" as I try to transition from the stock curve to the new, larger ones. It doesn't take a trained eye to notice if a fender has a weird transition in it either..... it really catches the eye and becomes a huge distraction that breaks up the visual aesthetic of the truck.
I'll take some time (probably this winter) to build my templates and see if I can show you guys the process I intend to use.... hopefully it will work out the way I've imagined it.
I feel like you will almost be lost when the front suspension work is done.
I think you're right.

I'm already wondering what the next logical step should be to move this build along...... even with this part of the process coming to a close, it's still an awfully big elephant....and there are a lot of bites left!!!
-G