Has anyone had success making your own power steering hose... the hose my m56 needs is like 420.00 with shipping, appears to be leaking at crimp point....49720-1MC1A that's the infiniti part number

Been around here a while and can't say I've ever heard of it being done. You may have to be the pioneer and document the process.

If you have the equipment to make hydraulic hoses and the necessary fittings, you'll be fine.
That's really all it is. A high pressure hose with special fittings.
If you came make a hydraulic hose that handles 4500PSI, you can make a power steering hose.
The challenge MIGHT be the fittings.

If you can, remove the hose and go to a tractor shop. Like a New Holland or John Deere dealer. Or a specialized hydraulic shop. If they can get the right ends, they can make you a hose.

Ditto ^^ . The only special parts to an OEM hose are the ends, but the hose itself can be sorted out with standard supplies.

With my M45, I took the high pressure PS hose to a Parker distributor, and they cut and reused the special fittings.
If you have some time, check out this video.