The very first iteration of my setup without the aftercooler put the accusump on top of the S/C in that valley between the front cross member and the S/C unit itself. It worked but wasn't a very stable position. The area where the cabin filter goes is looking promising though I haven't tried it. As far as trunk mount goes, that's a long ways to run an oil line in my books. I did see Sean's setup at SZ 04 that had it working that way.
Rick