It's a cool idea, but I think the layout would be way more use-able if you eliminated the rightmost column and moved the rest of the numpad a bit further.
Then you'd get back enter where it used to be, and it can still easily be reached when using the numpad. Additionally, you'd open up the option of putting an arrow cluster between the alphas and the numpad if you used a 1u 0-key.
I like that idea, I'll give it a try
Interesting; I was thinking more in these lines; but its wider
5x15.5 stag : 40% + Symbols row + 3/4 NumPad (http://www.keyboard-layout-editor.com/##@@_c=%23e0bdc6%3B&=Esc&_c=%23bdd4e0%3B&=%7B%0A%3C&=%7D%0A%3E&=%5C%0A%22&=$%0A'&=~%0A%3F&=%60%0A!&=%2F&%0A%23&=%7C%0A%2F@&=%5B%0A(&=%5D%0A)&_c=%23e0bdc6&w:1.5%3B&=Backspace%0A%0A%0A%0ADelete&_c=%23bdd4e0%3B&=%25%0A%2F%2F%0A%0A%0AF10&=%5E%0A*%0A%0A%0AF11&=%2F=%0A+%0A%0A%0AF12%3B&@_c=%23e0c5bd&w:1.5%3B&=Tab&_c=%23cccccc%3B&=Q&=W&=E&=R&=T&=Y&=U&=I&=O&=P&_c=%23bdd4e0%3B&=%2F_%0A-%0A%0A%0AInsert&_c=%23dee0bd%3B&=7%0A%0A%0A%0AF7&=8%0A%0A%0A%0AF8&=9%0A%0A%0A%0AF9%3B&@_c=%23bde0cb&w:1.75%3B&=Caps%20Lock&_c=%23cccccc%3B&=A&=S&=D&=F&=G&=H&=J&=K&=L&_c=%23e0c5bd&w:1.75%3B&=Enter%0A%0A%0A%0AScLock&_c=%23dee0bd%3B&=4%0A%0A%0A%0AF4&=5%0A%0A%0A%0AF5&=6%0A%0A%0A%0AF6%3B&@_c=%23bde0cb&w:1.25%3B&=Shift&_c=%23bdd4e0%3B&=%2F:%0A.&_c=%23cccccc%3B&=Z&=X&=C&=V&=B&=N&=M&_c=%23bdd4e0%3B&=%2F%3B%0A,&_c=%23bde0cb&w:1.25%3B&=Shift&_c=%23e0c5bd%3B&=%E2%86%91%0A%0A%0A%0APgUp&_c=%23dee0bd%3B&=1%0A%0A%0A%0AF1&=2%0A%0A%0A%0AF2&=3%0A%0A%0A%0AF3%3B&@_c=%23c0e0bd&w:1.25%3B&=Ctrl&=Fn&=Win&=Alt&_c=%23bdd4e0&a:7&w:5%3B&=&_c=%23c0e0bd&a:4&w:1.25%3B&=AltGr&_c=%23e0c5bd%3B&=%E2%86%90%0A%0A%0A%0AHome&=%E2%86%93%0A%0A%0A%0APgDn&=%E2%86%92%0A%0A%0A%0AEnd&_c=%23dee0bd%3B&=0%0A%0A%0A%0APause&_c=%23bdd4e0%3B&=,%0A.%0A%0A%0APrtSc)
Show Image
(http://i.imgur.com/YTH31oi.png)
By the way i've just switched from full to 60%, and I now realize how much I used Numpad enter and -
This layout is more practical, but part of the point of this was to have it in a 60% case. Although having it a little wider would make it a more practical, I didn't want to go through the pain of designing a case for it too.