I like the concept, but I have a few observations to make:
1. Your design is only 1u narrower in width and 1u shorter in the vertical than a 60%, when it's horizontal space that's more important for a compact board. It can be taken down to 12u width and still have all the important characters for English. For other European languages it may require , and . to be on a Fn layer, though. With your finger on the home rows, it's nice to have just one extra key on either side of each hand (Ctrl/Caps for left, Enter for right).
2. It's not balanced. F and J are the home keys, so the centre of the board should be right between G and H. This allows each thumb to hit the split keys better.
3. If you want to be able to type on it without a long adjustment period, make the stagger the same as a normal board. Otherwise it affects your typing skills on a normal board, too. This will make it instantly comfortable to type on and is worth the 0.25u increase in width.
I'd go for a base layout something more like this:
http://www.keyboard-layout-editor.com/#/gists/65ac4e37afb1a3bf1314More immediately familiar, plenty of layer options which are easy to access, no weird pinkie stretch for Fn, symmetrical on home row, properly centred on centre of typing area, no stabilisers needed since max key size is 1.75u.
Or get a JD45:
https://geekhack.org/index.php?topic=62641.0