XR will have the same problem, Too shallow of a pan.
Cheaper to make some stanchion risers to get another 3-4 inches, and have a deeper pan made. 16-18ga mild steel is fine, does not have to be stainless. Bonus is it will be a one piece.
CNC laser to do 1"…that will be 6 figures. Water jet might be cheaper than laser, and still stupid expensive unless you are going to do that on an industrial level for work.
Don’t know that the XR would handle a full 4x8 sheet.
I’m not sure my 100a Hyperthem would cut it with anything resembling quality. Especially if there is a curve. Better off using old school Oxy/Acel flame