I used to own an acrylic
business before I went cruising.
Look for a business with a laser cutter
. Any laser machine can cut 3/4" acrylic. A good shop will ask for one of the old lenses and then make EXACT copies (including all holes). It will look like it came from the factory!
Be aware that if you are only getting one made, then the price
will be very high (setup fees
, tooling fees
, ect). However if its spread out over a bunch of lenses it can be pretty affordable.
A CNC routing machine will also work
, but they usually have higher setup costs.