those are sick fender flares...do you have any dimensions so I can borrow the idea, if you dont mind that is...
the fronts started with a 10"x4" to 26"x4" to 20"x4" and i cut the angle in the front all the way to a point then cut off what i needed to make it fit and on the back side i went up 8" and out an 1" from the inside and cut the angle
then the back is 19"x4" 20"x4" 18"x4" the front is up 8" out and 1" then an angle and the rear is up 7" out an inch.
then i welded them up how i wanted them
welded the mounts on and mounted to body
figured out the tube angles cut them and tacked them on while it was mounted to the body
took off the body and welded up the under side
ground everything smooth and bondoed
its easiest to start with a cardboard mock up to see what you really want