Darn near impossible to mount the windshield before mounting the body. And mount the body with all the sealing material in place. Then you know "That's where the body will sit". And, with the body on, you can determine how much of the windshield mounting arms to cut off. They come a little on the long side. A hacksaw and a file for the sharp edges. No customization required. NO one will ever see it. I would think twice about tapping the holes you drill into the windshield supports. NO added benefit. NO added strength. It would make starting the bolts on the drivers side a huge pain in the 'Trump'.