Hi,
I use a pattern maker's rasp to rough shape the lock panels and wrist. The lock panels form naturally as you shape the wrist, tang, trigger, and forestock areas. Once the basic profile is done, I use finer half round and full round files to refine the radii of the lock panels. Then I move to curved scrapers to finish the job. After that is all done and the stock is almost ready for final scraping and stain, then I cut in or outline lock moldings and cut beaver tails. It does not take very long at all to rough shape the lock panels and wrist of a squared up stock blank using a pattern maker's rasp. I think Acer has a cell-phone video of me doing this at Dixon's.
dave