There are plastic table saw blades that cut acrylic beautifully. If all you’re making is rectangles, you could do that easily.
Or, you could buy acrylic custom cut to shape. Professional plastics and others can get highly accurate custom cuts for you.
Or you could buy small rectangles at a set size and then design to that size. Here you go:
The laser is slick and all but it is massive overkill to just cut lots of the same rectangles.