As Jordan posted these are definitely custom boat builders ....and yes, you can definitely get a windshield if you'd like one.
Ron, you should come up and test drive one. If you do come up, pm me and we can take you out for a ski behind our Prostar. They are less than an hour away.
The J's are clearly not a tournament ski boat. However, with the Perfect Pass, they are definitely a sports car for the water and can still pull you through the course, barefoot all day or blast around at high speed.