These lattice designs were made in my small garage shop in Port Townsend in the mid to late '80s. I had a Seattle area CNC machinist make very accurate fixtures for cutting the slots using a normal plunge router.
Another theme developed during that time was a system of knock-down shelving using threaded dowels which also integrated the interlacing lattice.
The interlacing wood and steel design to the right was made around 2005. The frame was made from thin maple and sapele veneer using a normal paper cutter and craft store paper punch.