Hi Fredrik. I'm not sure I completely understand what you mean, but if you back up your Moi installation then you can apply this UI mod by copying over the files to the new installation, and launch whatever "version" of the two you wish at any time.

Make it a theme.
Back-engineer the whole thing again.

I dont want to write over my Moi3D.

Was that fair enough?
I think the idea is great.

But not to write it over, its seems a bit too...lazy...
Especially when V.5 is out...

This is NOT a theme, it replaces parts of the UI.
And you don't "write over your Moi3D". You make a copy of it and overwrite that copy with what's in the zip. It's literally 2 steps.
How's that lazy when you don't want to put the slightest of effort yourself?

Ill fully understand.

I made my own Theme with the "blackness" in mind. (see embedded picture on best laptop buy for Moi3D).
Not black but more dark...LOL...
Although it would be cool to make it a theme-compatible named Black (or something)...

But ill understand what you mean.
I prefer the Thematic way of doing things for now.

No worries, I understand too, and I hope my previous reply didn't come up as rude! (It's the language barrier)