Has anyone else upgraded their entire z-axis?

I have upgraded to Ramps with Taurino Power, marlin, E3D clone, auto level probe and various other parts, last piece to do is z-axis.

I am thinking of keeping the lead screw part, but upgrading the rails to aluminium extrusion and having them on runners and then change the bed to an aluminium extrusion one too then setting the heated bed almost directly on top of it (with a few shins), this should make it much more sturdy and an upgrade to the plastic parts.