sewing caddy undercarriage attachment

My next step was to cut some grooves into the lateral sides of the undercarriage to receive the interior edge of a long "tennon" used to hold the piece together inside of the outer carcass:



I used a chisel to beaver out most of the material between the saw kerfs, but resorted to fabbing up a 1/4" sanding stick to smooth out the bottom surface



Here, you see a few cleats I glued up to the interior of the carcass. These will be reinforced with oak doweling



Here are all the parts: undercarriage, carcass, and two "tennons" that I hacked out of a piece of bubinga from a local hardwood store's cast-off bin



Everything together:


Here's a vid of how it works