Been gone from these parts since the days of the Super V.
Had some pulp coned full ranger JBL LE8s looking for work, thought I'd bump the plans, gather MDF waste and marry things with the PE Neo 3 planar, 1" denim faced 1# MLV, and finish in Mohawk perfect brown lacquer.
Baffle is 1", Neo cutout 45* full depth chamfer, requiring a mount plate to attach planar which remains flush with rear baffle surface. Top (incline) is full 3/4 rather than plan's 1/2". The top and bottom drivers are as physically close as can be. Driver time align is very close. JBLs run full range, they drop out around 5k. Simple coil/cap hi pass to Neo at 3k. Sound is exemplary, neo open baffle is best described as a smooth airy horn, JBL plays 40ish low, punctual within design's inert construction. Huge stage, image outstanding, these play "large" in my 15x24' diffusion attenuated room, giant killers ! May try a lower pass filter at some point Thanks for the plans, Danny.