If you google "meier floor plate release lever", you will get a slew of information. When I was a kid, I read Jim Carmichael's book "Do-it yourself gunsmithing",
he has a chapter on making a hinged floorplate with a lever release. He makes it sound so easy. I've actually made a few hinged floorplates with lever releases,
Here are some good threads on other forums if you are interested.

one way of doing it

another way of doing it, if you have a machine shop at your disposal

Larry Potterfield of MidwayUSA, has a good video, on making a hinged floorplate with a latch release, he sure does make it look easy.

Potterfield video

and here is a thread about my attempts

Whitey-Fred rifle


Best wishes

Fred