Shock Axe Warriors traditionally use only Prophecies skills. I don't know if people still use them or if they've been modified. Check gwpvx.com and look through the builds there. If there are any that interest you but have one or two skills you don't have access to, post it and we'll see if it can be modified.
It might help to know which PvP formats you are looking at. Some vary the builds slightly, others vary them radically. Shock Axe is an overall solid build but pretty limited in Jade Quarry for instance. The level of tolerance for a not-quite-optimal builds also vary dramatically.
Anyway as long as you aren't playing on competitive GvG/HA teams that demand specific builds, you can be reasonably effective most any of the core classes. Some suggested builds for RA:
It's actually somewhat hard to avoid nightfall skills when making a modern ele, so that's the only one I recommend leaving alone till you are ready to experiment.