4X Innovations High Clearance rear Bumper Install questions

I am ready to make body cuts in order to install the 4X I high clearance rear bumper on a 2015 TRD OffRoad, and wonder if anyone can guide me on the placement of the sheet metal cuts needed to be made This seems to be a situation of measure once/cut once; measure again/cut again. Any pitfalls I need to be aware of?

TIA
Ken

 

Pretty much high clearance rear cuts are the same regardless of brand. Make it even with the bottom of the taillight of a 2nd gen. Always lean towards undercutting the drawn line. Can't fix overcutting.

Per install instructions:
-At the rear corner of the bed, measure down 17.5 inches from the outside edge of the bed liner and mark this location.
-At the front of the fender opening, measure down 18 inches from the outer edge of the bed liner and mark this location.
-Carefully stretch masking tape between the two marks, with the bottom edge of the tape at the top of each mark. Being sure the tape forms a straight line. Use your straight edge to ensure the line is straight.

https://www.youtube.com/watch?v=I3WHSZ7vHxs

 

Honestly, just eyeball it, it looks to be about a quarter inch down from the bottom of the taillight on their website and level

 

Normally, I would agree, but their instructions call for a 1/2 inch upward rake back to front, make that cut, fit the bumper gussets to the frame with c-clamps, measure again, cut again. I think the expectation is for tighter tolerances and a more "appealing" look.

I got nothing from YouTube on this particular install. Thought I ask the group for some insight before calling 4X I in the morning.