wouldn't aluminium necks massively decrease resonation??
Of all the metals used for guitar hardware, aluminium has the greatest volume and tonal effects. It is great. The reason I didnt use aluminium for the multiscale single string bridges was more because of strength. I used steel and stainless steel in the end. I would prefer aluminium, but the walls of each saddle base are too thin.
I have aluminium hardware (trems, tunomatic style bridge etc) coming soon.