Any luck using Linuxcnc to run a Hualong bridge saw?

No luck needed, pretty much any machine can be made to work with LinuxCNC, it all depends on how much trouble/work/money it takes, and almost always it turns out it does pay off.
Having schematics of the existing machine saves a lot of time in reverse engineering and figuring out wiring, having someone who knows a bit of electronics helps a lot, so having both leaves only money, and that is very cheap compared to the value of the machine, usually 200-500$, rarely more.
Pictures of everything in and out of the machine, especially the control cabinet, if there are no schematics, help as there are plenty of members here who can figure a huge amount of info just from looking at those pictures.

Agreed, it should be easy. I doubt that it needs to make coordinated XYZ + BC moves, so the CAM shouldn't be too hard either. (LinuxCNC can do 9-axis coordinated motion, but the CAM to create the G-code can be difficult to find at affordable prices)

It looks like a fun machine, I imagine that there are a few pumps to control too?