If you want to buy, rather than make one, Arc Euro used to offer something similar.
I made one for my Mill from a length of square steel, cut to length and with close fitting end cheeks of gauge plate.
Each of the three sections, (Fixed, Moving and Forcing ) was secured to the table with capscrews and Tee nuts. The forcing screw was a 1/2 – 20 UNF setscrew with a 3/4 A/F head.
I think that some time ago it featured in MEW as "My Biggest Vice"i
HTH
Howard