I mounted a circular saw under the bench and hold it with 4 bolts and wing nuts. I made 4 holes on the circular saw base 3 of which are elongated for fine adjustment. I also cut a space for insert plates from 0º to 45º clearance and added 2 miter track slots to the left and right. The circular saw is powered by a safety stop switch and can hold a riving knife also on the blade (not shown here).
My wooden rip fence is made out of 3/4 MDF body and hard wood for the round center piece and the off center handle; also a small aluminum angle is used to run on the fence guide rail. It’s design is based on Biesemeyer fence. Left site of the fence is used for ripping with the circular saw and the right site is used as the router fence with an opening and dust hole.
The fence guide rail is simple a 2X2” attached along the side of the bench and with an aluminum angle across it so that the fence locking mechanism won’t damage the 2x2” when tighten. A UHMW tape is used to help the 2 aluminum angles to run smoothly.
Some push sticks have also found there way on my tool-bench. Even though almost everything here is home made, security was always in my mind before anything.
My miter gauge is a mixed idea from various DIY designs (one is from Phil B instructables). Hard wood bar piece to run into the miter track slot, plywood for the body, a clear protractor, a piece of thick clear acrylic and a wooden handle with a T-nut at the bottom to act as a tightening handle and keep everything tight in place.