I haven't done this but have heard that a glass shop can cut you a glass
to fit then send it out to have it tempered .
As you probably know tempered glass can't be cut , it will shatter .
Finding a new or used one would be best since I'm sure it will be more
expensive this way .
Auto Safety glass , 2 plates of glass laminated with plastic between them
will work .
Your windshield is made like that and can be cut to fit and is safe .
This glass is what cars used to have all around , doors , vent windows ,
etc. everything was safety glass .
An auto glass shop can cut it for you , ask an antique car rebuilder
for a recommendation .
