Here's some of the mods I've had to do to allow the guard to release tension. This is a better way than just pulling the panel to line up. The panel has a couple of layers behind the cut to stiffen the panel back to where it was. Doing the filler I'll carve a big V at the cut lines and scruff up the surrounding area for best adhesion, there won't be any evidence it's been cut at all.

Used a sanding block wrapped in plastic as a wedge to keep the panel pushed out, the other bits have a plank of wood while drying

Driver's guard is just sitting there, placed the grill to see if gaps are ok. I measured the guard gap for the bonnet and it's ok, won't know for sure till it's actually on.