Just curious what you are doing for crossovers for these drivers? I’d like to build some passive xovers for mine.
I’ve heard the xover freq is between 1.2khz and 1.5khz depending on what HF driver is used. Possible options might include

Markwart 604 xover
M19 xover
Urei 811 xover

Any other ideas or thoughts?

Also if you have a chance, can you measure the outside dimensions of your cabs including the port size pls?