It looks amazing! Though I have to say, while I'd be confident making a private seed wallet, making my own art piece is a whole different ball game. If there is a way to mess it up, I'm sure I'd find it! lol
When marking these up its definitely crucial to do so patiently, taking breaks as needed. The engraved dots retain the permanent ink remarkably well, so if you did make a mistake you would probably need to start over with a new disc. It's really a pretty straightforward process so long as you're sober and take your time

If you wanted you could lightly mark the dots with the included pencil first
And I will have replacement discs available soon - for if you mess yours up or just want to restore a used one to original condition.