Hi all:
Just finished one for an L39.
It consists of a 1"x3"in frame attached at the top of the Rops/Fops
just below the lights. With another around the mid level, at the top of the hood/fenders.
In the first instance two years ago I used Dollar Store plastic tablecloths. reinforced with ducktape at the attachment points
stapled onto the frame, also tied through grommets.
Space below the lower frame was filled in with cardboard or Aspenite
This lasted two years. Last winter finally beat out the tablecloths.
Visbility wasn't too great, lots of distortion.
This year I replaced the tablecloths with 20 gauge plastic window sheeting
Relatively expensive, but it looks great, like a full glass cab.
I'll post a picture later.
Next year I may replace the front panel with the hatch off a 1975 VW Rabbit
which has the advantage of having a windshield wiper.
Hari.