A few years back I purchased a restored Hallicrafters SX-28 receiver.
While doing research on the history of this beautiful radio I came upon a site describing the companion R-12 bass reflex speaker. Inspiration for my project started here:
My cabinet closely matched the dimensions of the original and is mostly ¾ in plywood with the exception of the sides made of ¾ inch MDF in order to achieve the radius on the waterfall edge without exposing the core material of plywood. The cabinet is painted in a matte gunmetal gray similar to the original.
This is the original Hallicrafters speaker
This is my Reproduction
Here is the plywood assembly