How do I execute this keyboard layout?

[cassi0peia__]

Hello,

I'm somewhat knew(ish) to the world of mechanical keyboards here, so I was wondering if anyone might have any idea what this type of keyboard layout might be called?
Also,  Assuming I would need to construct this from scratch, does anyone might know the best and easiest way I could build something like this?

[Findecanor]

Welcome to Geekhack! That is commonly called "symmetric stagger".

I would look at the Katana60 which has a similar layout but with the gap a bit more to the right. The first version has been sold in kit form at CandyKeys (if not more places), and a version 2 is in development.

bpiphany also designed the Blue Pill which is closer to your layout, but I don't think he ever got it manufactured and sold.