63" wide, I will make it 2 pieces. I will use a festool domino to make the seem between the panels. I want to replicate the FUTV style vs 3 piece on trailarmor.
Service manual says P1k is 63" wide. I will measure exactly rail to rail when I get home. Figure 63 is a good starting point for pricing.
The only down side to the mid belly lateral split on the skid plate is that the factory rock sliders are about 3/4" higher off the ground than the center frame tubes so you'll be bending the plate around the edge of the frame on both sides. I avoided the lateral split because if you're sliding over rocks you will point load and flex the UHMW and you could potentially get hung up on the seam in the material where it is unsupported between the rock rail and the frame rail.
For me the longitudinal seam made more sense