No, Lexan was cut from 4'x8'sheet. The bottom has .060" aluminum angle bolted on to stiffen it up (1/8"). The door release is mounted on aluminum channel as well with a piece of 3/8" steel fuel line welded from the door release to the vent frame to keep the handle from flexing. A Home Depot closet door roller is modified to ride on the front of the vent channel to keep the window from tilting. Vent is Lexan also (1/4").
All cheap stuff. My 63 Dodge H/T was done the same way.
Doug