I at least bring up ceramic choices for their versatility... but for most folks they are a big bite out of the wallet for a first smoker. Then I bring up a UDS, however in the 7 or 8 years I have cooked on mine... I don't think anyone has taken measurements and built their own.... and I usually offer to loan them one to try out.
Then I steer them to a WSM.
KCBS - CBJ
Big Green Eggs, Big Drum Smokers, Big Chiefs, Weber Smokey Joe "Custom Tall Boy"
Oil Patch Horizontal
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Barbecue is not rocket surgery