The Side Pieces Are Cut from 1/4" Nominal Plywood. The Top and Bottom of Each Section are cut either from 1/2" plywood, or 1/2" plain wood. The holes in the top of each section need to be fitted to your size tumbler. The InkPixi Glasses come out at 3" in the center. Here is a link to the Glasses used. https://www.inkpixi.com/items/american-original/clear/pint-glass-engraved-(single). The sides are screwed in with 1/2" wood screws at each corner, and I used Acorn Nuts and Carriage Bolts - 1/4-20 in Stainless backed by 1/4" washers fora finished look.
Here are Additional Details: Inkpixi Glass SIZE american original a459 5 7/8" tall 3 3/8" Width at Top 2 3/8" Width at base Which gave a hole center width of 3" Project Link https://easel.inventables.com/projects/PESp9pOYyOh_S4eFOhhtBg
Martin Gutzmer