I had a glass top for years. It worked great but I had to do some work to it. Clear aquarium caulk/seal is easy to use and make look good with little or no lines visible depending on how the glass is placed in the lid. I have to admit I bought mine at Sam's club for next to nothing and had very low hopes of how well it would work but I did much the same as you are doing now and asked for help and opinions. I chose the advice I could afford and accomplish on my own and was very pleased in the long run. That humidor now sits with a fellow BOTL in KY that is relatively new to the hobby and still keeps good humidity.