BIG hole in Blazer Top

[underliner6]

I am looking at a Blazer where the original top was cut to install an RV type vent. Besides the massive hole cut out, the top is in very nice condition. If I were to pickup this Blazer, I would not be able to live with the vent and would want to get it fixed. I have read threads about boat repair shops and fiberglass guys being able to fix top damage but is it possible to fix a hole this big? I would think you would almost need a “patch panel” cut from another top to cover such a large area. What’s your guy’s opinion on if this is reasonably fixable or not?