Rear glass?

i didn't get a rear window when ordering the front laminated glass.
Starting to regret that now, but want to know what other builders did.
The surface that needs to be covered is not far from flat when i but a ruler on, but it does have a soft bend in it.
Would it be feasible to mount a plastic window and force it down with screws and glue? Or won't it bend properly depending on thickness?
Please feel free to describe what you did and the results that came out of it :)