IMO it doesn't look that ergonomic. First of all why ISO-enter space buttons? why not just 1x2 keys? And on top of that I think that those space buttons are a little too close to your palm, unless you have tiny hands I don't think it's too comfortable. Also, do you have a "primary" space thumb? ie. if you only use your right thumb for space, you could have the left button do something else.
Second, on normal keyboards the pinkies get too much work to begin with. It looks like in this layout the pinkies get even more keys to control, so why not shift a row nearer to the index finger/thumb.
And with that all said, why not get an Ergodox 
I think it would be helpful to give us a bit more details.
What is your usage of it ? What do you type the most ?
Do you even code, bro ? 
I should note I am making this already, and its basically to late to change anything.
It would be used for gaming and regular typing.
Iso space because I prefer a bigger space bar.
I tested, its not too close.
I could always program the other space bar to be something else.
Actually, it seems like most of the time I hit the space bar with my right index finger for some reason.
Although actually, on my Apple Adjustable Keyboard, I do use my thumb, let me determine which one...
I type kinda weird, my left hand sits on the wasd cluster. i dont generally use my pinky for anything other than shift.
Why not an ergodox?
I want to build my own, and the thumb cluster makes it big, and I dont want to many changes, and i want f1-f12 keys.
