Steve, as you consider wood clock plans, pls keep in mind that some of us cut them with a laser printer/cutter. Thickness isn't usually an issue because it is easy enough to laminate thinner pieces. Similarly I cut and splice to create pieces otherwise too large for my printer. I've been using either baltic birch or hardwood veneer on mdf for my clocks, most of which are Clayton Boyer design.
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Good point. The gear tooth profiles in the crazy gear clocks are close to what is needed for CNC or laser cut gears. I am part way through a conversion of the SP2 tall wall clock with a few improvements. Most gears will be a standard thickness and the pinions will be 2X thickness. 1/4" thick gears would use 1/2" thick pinions or two layers of 1/4". The weight shell gears will start out 1/2" thick to support the extra load.