I thought about this with mine, I can't see a reason why it couldn't work and it would make things a lot 'cleaner' around the engine / trans.
What stopped me was that you'd need to do something about the oil manifold on th engine... ie make a new one designed for the oil pipes to exit down instead of up.
Fr the right person with the right equipment, this would be quite straightforward, but it was enough to stop me!