OK, what's the cost difference in dollars between the 1 lite & 2 lite doors? $100? $150? I can see it taking 2 or 3 hours to do a good job of modifying the single lite door. What's your time worth? If it's only 1 door, you're probably better to just buy the 2 lite door. But if it's a bunch of them, then you could set up production & maybe make money by modifying them