The base was pretty straight forward: it’s 16” x 16” x 8” and the hole on the inside is 8” x 8” It’s all made from 3/4” MDF. I really hate working with MDF, but the extra weight and the smooth surface are perfect for this project.
I attached a piece of scrap 2x yellow pine to the bottom of the slab. The base will slip on to this scrap and be screwed off. The below photo shows the assembly – minus one of the outside faces of the base so that the structure is apparent – flipped upside down:
And here’s one right side up with the outside face:
The hole was rough cut to size and then trimmed with a flush trim router bit once assembled. Currently, it sits in the workshop waiting on the putty to dry in the counter sunk screw holes. In retrospect, I should have used a brad nailer – it would have been a lot quicker to fill and Norm would have approved, I’m sure.
And still, these photos make the base look smaller than it really is. It’s 1/3 of the total width and does not seem undersized in person, but the pictures make it seem too small.