I'll have to read that. I've already read a few different articles on inductor placement and transferring the schematic to a physical crossover, I've just never actually done it.
I have all the parts, but am missing a tweeter faceplate since I had to send it to John so he could get exact measurements off of it.
I haven't seen the flatpack kit you're building and what size it is. When will you actually install the crossover board? Will you mount it
as the cabinet is being assembled, or
after it is all assembled? Depending on the size of the woofer hole, this can matter.
Years ago when I started building small 2-way speakers such as the CAOW1 with 5½" woofers, I built the cabinet first and later installed the crossover board. After a few false starts where things wouldn't fit through the woofer hole, I cut a board, placed the largest inductor coil on edge, and tested it to see if it could go through the hole and then sit flat on the cabinet floor.
Probably a better way for smaller speakers is to mount the crossover board before the cabinet is fully assembled.
Another hint, use 16 g or smaller wire on the inside of the cabinet. Anything larger is too difficult to solder.