I agree with Craig. SLA might be a good way to go with this, depending on the casting firm. The SLA part will require some cleanup work before sending to the casting company. Make sure you get some radiuses at the vane/hub/ring junctions, to relieve stress and to get better flow of the metal through the ceramic mold. We've worked with Howmet before for casting Ti nozzle parts, but I've never played with Inconel.

You'll most likely have to deal with scaling factors, due to part shrinkage during cooling (on order of 1-2 percent), and multiple shots, since the first casting is usually scrap (learning curve).

Not familiar with the wax systems... That might be even better than SLA for this.