Although laptops are not supported by Mach3 anymore, as they were a majority of support requests, there are a bunch of people running them.
I guess if it works for you , great.
It also tends to be hardware specific as some will run it and some won't.
300mm/m = 11.?IPM. I would guess that 1000mm/m (40IPM) would be more apropriate for wood cutting, but I haven't cut much wood on my router, YET. I mostly do fiberglass and CF. At this point you don't have anything to lose. Try it and see how it works. You already have nema 23 mounts, so upgrading to larger/faster motors would be easy.
Better electronics are just a charge card away.
I will keep watching.