“ Hi Gerald, It would be difficult to control a router set up on the 1x4 because cutting action would make the router move forcefully in the cutting direction.
In the article I cut the pattern with a bandsaw and rough out
the workpiece on the bandsaw also. The final step is to use a router
with a flush trim bit that follows the pattern and shapes the piece.
Even though there's a few more steps it is very accurate, pretty simple and actually very efficient for limited production applications.
Best, Matt ”