Bootlegger wrote:... what would be the best column height and Liebig length?
Riser height depends on if you like to bend over to pick up your collection jars from the floor. On a potstill (which I believe your Clawhammer is), the riser is usually only tall enough to improve your setup's geometry. That is, you won't really get the benefits of reflux from it.
Now, if you add a reflux condenser then your column height (and packing) will affect the purity of your product. Higher/longer columns (ideally 20-25 diameters in height) will get you the potential for azeotropic alcohol (95-96%ABV).
But I think you're really aiming for potstill operation with the potential future operation with a doubler (thumper). In that case, you really don't even need a riser....you could attach the 90* elbow to the top of the boiler directly. It all depends on what you have planned...to run, to produce, and how you run it.
The bill of materials list I built up a few posts was really a price comparison to the ebay potstill you were asking about. I got prices from Menards website for the materials as a basis.
As for the Liebig size, there is a calculator on the parent site which helps you size the product condenser (for a potstill) considering the input power. If you know what you want to power with, you can calculate (approximately) how long to make it.
A general rule of thumb here in the forum is a 36" long 3/4" over 1/2" will handle up to 5.5kW. I would feel comfortable with powering up to 4.5kW at least with a 36" long Liebig. Perhaps the 5.5kW is workable if you have enough water flow. Certainly, plan to use efficiency design practices with it however. Read a few of the build threads to get an understanding of how to improve the efficiency.
Hope this "rambling" helps you decide what and how you want to build.