I'm almost finished with the cab for the Power King. It's made with an angle iron frame with 1/2" plywood sides and top. The windows are 1/4" Plexiglass I got from my son and one piece I bought. I bought a bunch of tables at auction, and the angle iron came from them.
The first picture is the angle iron frame. Pic 2 shows the dogleg on the back vertical corner that bolts to the fender using the fender bolt. Pic 3 shows the front corner where it bolts to the top of the frame. Pic 4 is the left side with plywood attached. Pic 6 is the right side showing the door. Remaining pictures are after I cut the window holes and attached the Plexiglass. The front window is tinted plexiglass on the top, the one I bought and didn't know it was tinted til I took the paper off. It's pretty much done except for paint. I don't plan to put a back on it but may close off the front bottom with canvas if the snow blows in. I will have to put a brace on the steering column and maybe a step under the door and I am going to try to get clear plexiglass for the front.