Yeh, but maybe it's better weighing a ton than having a really light body with a really heavy neck? It would be all unbalanced, if you let go of it and let it hang by the strap the headstock would be pointing towards the ground. I dunno though, try it and see.
Also, something to watch out for, I was thinking of building an aluminium neck for my bass, but I heard there's lots of problems with tuning stability so I gave it a miss this time round. I still lose a bit of stability with the aluminium body, but it's not nearly as bad. The problem with it is, when the aluminium heats up it expands, and when it cools it contracts, enough to be a problem. I don't know about stainless, you'd have to do some research to find out if it's going to worry you or not, but just something to keep in mind especially on a neck.