I like the idea of cutting a sheet of cement board to fit over the top of the desk and then covering it with sheet metal. I would cover the whole top of the desk with the metal though because, as has been stated, cement board will deteriorate over time and can get dusty and a hot rod will leave burn marks making it kind of ugly.
My lampwork bench is a framed out table built to my desired dimensions (8 ft. long) with a custom made concrete "counter top". I have it sanded and polished smooth as a marble counter. Easy to clean and impossible to burn with a hot rod. Very easy to do if your husband is up for it.
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