ok guys... it is pretty easy. just have no fear.

first i sanded the plexi. i used 400 sandpaper and i started with my hands. shitty idea.

it would work but it takes far too much time and skin from your fingers.
i decited to get me a "schwingschleifer":

with this baby things are so much easier. i also noticed that you could use 280 sandpaper instead of the 400er in the first step. i sanded everything try by the way. no water or other liquids.
after i finished the first sanding i startet with the 400, then the 600, 1000 and 2000 for the finish. i guess you could polish in between every single step but i did not do so. after the 2000er sanding i took l lot of Xerapol.

followed by some PlastX:

The problem with polishing by hand is that it takes ages... just like the sanding. So I got myself this device:

Pretty big but it works. The result could have been nearly perfect if i would have taken more time here and then. 5 minutes of more sanding for each paper, 10 more minutes with the polishing machine... i guess that would have left me with a nearly perfekt result. But as i told you guys... Phoenix is an old machine and this baby can have some little scratches here and there.
Oh yeah... I also sanded the metal parts, grounded them and painted them black. but you guys know how to do that for sure.

greetings from trier!
stefan