How to turn and finish,you ask?
Here is what I do:
As far as turning and polishing,it turns very easy,not much harder than a trustone or hard acrylic. Skew, gouge, scraper, take your pick! I use a 5/8" gouge to rough,and a 3/8" gouge, and rounded skew to finish.
Apply WD-40 to cuts if gummy or you are not getting nice shiny finish off the tool.
I start sanding wet with mineral spirits, to keep the aluminum from clogging the paper. I use 220, 320, 400 Norton 3x then black 600, 1200,1500, 2000 wet/dry 3M auto type paper,again, all wet, and clean with paper towel between grits. I use an old small metal coffee can
for the mineral spirits,and just dunk the paper in,to start,and to flush it off.
This can all be a little messy, but does not take long.
Then, clean off good with dry paper towel, I use Novus 2 on a small pc of folded paper towel, use a good bit of polish,s o it stays wet. wipe clean, repeat 4 or 5 times more, and using Brasso polish (I got mine at Menard's).
I repeat a couple more times.
Top off with a good wax, and buff.Repeat as needed in use.
If you are handy with an aerosol can, you can clean blank good, and top off with clear lacquer, just don't expect it to hold up forever. It is a big step above wax, though.
Have a powdercoating setup? Great,the clear powdercoat is excellent for aluminum, and should last for the life of the pen.