I made this some time ago and have since made another better one in the same way, but slightly larger and with non slip mat glued to the bottom of the rail. It generally requires no clamping.
I’ve seen a lot of people make their own but the down fall to some is that they attach a guide rail to the bottom of the saw rendering it useless for normal use unless you detach the guide rail.
I went the other way and have the guide rail dadoed into the track, and then I have attached a 6mm sub base to my saw that has a dado routed in it. This allows me to use the saw without the track and provides a zero clearance for cleaner cuts.
Both the rail and sub base is made from scrap laminate flooring and is very hard-wearing and most importantly,
I lose 12mm depth of cut but I only use this saw for panels mostly so it is still sufficient.
On the down side, the blade guard is inoperable, so i am in the habit of not lifting the saw until the blade stops moving.