I'm afraid that Sparky's approach would get gigged here. I've seen it tried but it always gets a red tag. It's a perfectly good way to get the conduit in place and protected, but it weakens the studs too much to make the framing inspector happy.
When I'm doing new construction I either run the conduit horizontally before the doors are framed so I can stick in a long piece of EMT, drop down through the top plate before the roof deck goes on, or wiggle shorter (36") pieces into the holes I drilled in the studs and used more couplings than normal.
If you're installing a metal raceway in existing construction, you might also want to see if your local Code allows FMT. You get the advantages of EMT but it's much easier to put in.
Best of luck to you.
