We have designed the water tables we will be selling with the idea that people can cover them with a router spoilboard (if you only do occasional routing), or you can mount the water table on top of a normal spoilboard if you only do plasma once in a while. So it's certainly possible to do plasma and routing on the same machine.
That being said, the changeover between the two is not going to be a 5 minute affair. For routing, you likely will need to re-surface your spoilboard after you put it on. If you leave a spoilboard mounted permanently, you can take the water table on and off, but you will need to deal with draining the water to do this, or get some really strong friends to help
Best regards,
Ahren
CNCRouterParts