No, not an engineer at all 
I just read about using humidity trays in "Orchids for Idiots" or whatever the title is. I've since modified the first ones I made and no longer use the BBQ trays. They turned out to be too flimsy in the long run. I now use the small dish tubs you can buy at Walmart for a few dollars and also some plastic louver material I found at Lowe's. Most of the louvers have been cut to fit the tubs better, some I still have to do. After I add water to the tubs I add in some algae preventative for pools and also mosquito bits.
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