This is a layout file for a DZ60 keyboard using a split-spacebar and a 1.75u shift key. It's based on the default DZ60 layout with additions for essential/useful keys like arrow clusters, home/end, print screen, and volume up/down keys.
It uses two function layers: the first for less-common system keys and backlight/underglow settings, activated with the default function 1 key, and the second layer for common navigation keys like arrows and paging. This second layer is activated with the middle space key for easy thumb activation.
I also replaced all the macro keys in the default second layer with the F1-12 keys, to make them easier to access.
To see how each layer is set up, take a look at the images at the bottom of this gist.
To use this layout, just head on over to http://qmkeyboard.cn/, and upload a copy of the json file. Customise it all you like, then download the .hex file via the Compile submenu.