Column Size for Modular Still

[Zipper]

Even though it requires higher wattage, boiler capacity & packing, I would prefer the speed from a larger column as it’s rare to find an 8-12 hour window during my time off. Over the years I’ve collected 2” and 4” materials intending to build a modular still. My intent was a keg boiler with a 4" opening going to a 4” column & tee and then reduce down to 2” for the elbow & shotgun condenser.

I would prefer the 4” x 48" column for reflux runs but has anyone successfully run a pot still with a 4” column?

Although I can get a more efficient height ratio from a 3" column, I'd rather use the 4" material I've already collected. Not trying to reinvent the wheel, just trying to save some $$ on the build. That said, I'd rather spend the cash than be totally frustrated with my equipment. Any advice would be greatly appreciated.