Horn Design Help

Hello everybody. I've become really interested in horn design and have recently become the proud owner of a cnc router. This has presented me with the ability to fabricate horns relatively easily. I have begun researching horn theory and design and have downloaded hornresp and If I'm being honest I'm finding it difficult to get to grips with. I'm also struggling to find any resources to get the ball rolling again so was wondering if anyone could suggest anything they have found useful as a learning resource. I should probably also mention that I intend to start by making mid to high range horns but I have heard that hornresp is mainly for bass horns. Is this true? If so, any advice? I have a few spare p-audio BM-D750 compression drivers (link below) financially this seems to be a good place to start. If anyone could offer any help it would be massively appreciated.

P-Audio BM-D II Series BM-D750 100W 2" Throat Compression Driver

PS. I would also be open to collaborating if anyone has a horn design they want making.

Cheers everyone