You have the option of a older one and re doing it...........
I am making a custom one for mine.......but any reason is a good excuse to acquire more tools such as a walking foot sewing machine.
Thousands of videos on youtube on how to make various seams and sew in windows etc.
For me the cost of material and a sewing machine will be far less that a top will cost and I can make it the way I want in the material I want.
Jeep...the first vehicle on the moon.....next trip we are bringing the tub!
It is gunna cost more and take longer than you thought...plan ahead!