Nice guide, simple but concise!
If anyone wonders some day with the Forza special edition 1914 controller, it has an additional rubberized section like the clipped on side rails. The Forza controller disassembles in the same way as this guide, you do not pry off or remove the additional inner grip strip. The additional inner grip strip is permanently bonded to the bottom shell piece, with no new screws under it or anything.