For those of you who don't know me, I am ninjascience, the biggest Advance of Zeta fan, anywhere! period. I hung around for a while in the AoZ Group Build thread as annoying but harmless sychophant. I played with gunpla years ago, but my kits have been in boxes for years due to the tiny iron sphere that l live in at the bottom of an ocean. If I used an airbrush to paint models I would suffocate and die. So a "new" no paint method is right up my alley. Now before you say: "But ninja! Every noob in middle school can snap together a kit and sketch in some panel lines with the 5 weeks of allowance they used to mail-order a black Gundam Marker!" I say: "NO! This in not that thing!" If you don't know what I'm talking about, check
this out. The article isn't finished yet, but it's got the basics.
So here's my attempt at this method:
I'm going to use a poor innocent 1/100 Serpent Custom as my guinea pig.
First I had to figure out the sanding, I tried it out on an EVA battery.

The sanded one is on the top, and the un-sanded one is on the bottom. I sanded one side with 400 grade and the other with 600. The 600 one is the way to go, it was way to easy to see the sand strokes with the 400.
Here's a ubiqutous test fit shot that shows I've done almost nothing:

I have my doubts about achieving the same uniform matte in those magazine scans. I suspect that Gyan was sandblasted.
I'm an unabashed kit-basher, so doing a no-paint build is going to be an emotional challenge. I can do subtractive customizations, but that's about it.
One problem: how well will decals work on the matte sanded plastic?