Great work!
When I did an internship in a metal workshop back in 1997, I had the opportunity to produce a dice (or die? I cannot tell singular and plural apart for these) from a block of aluminum, using a lathe for the shape, rasps and sanding materials for smoothing the edges and then a power drill for the pips; very moderate, those, but the overall weight should balance it out in any case. The dice is 30x30mx30mm, and unfortunately, I've never actually used if for rolling for results, since most folks were worried about the 1D6 damage it would do to their tabletops. So it's mainly a turn counter.
Other than that, I've also done scatter dice from wooden blanks from the DIY store because I didn't want to pay the price GW demanded back then. And I've "modified" two sets of polyhedrals for use as Firepower Dice for Stargrunt II by painting explosions on the highest numerals.