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My brother owns a sheet metal fabrication company. I gave him the plans that ran in Model Railroader, and he welded one up for me.
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On Jun 3, 2020, at 2:27 PM, Todd Sullivan via groups.io <sullivant41@...> wrote:
I built my own probably 30 years ago using 1/8" hardboard for the bottom, sides and back, with triangular cross section molding where the panels joined. I added a vertical slot at the back for a standard size furnace filter, and made the top from Lexan clear sheet to allow light in. The inside is painted white, which I protect with clear food wrap. I used two surplus computer cooling fans with inductive motors (no sparking) at the back to pull the air out and through the filter. Probably a squirrel cage fan would be more effective. The waste air was ducted out a window using dryer vent components. The face opening is probably 28"w by 16" high.