I recently got NanoDLP working on my LittleRP2 Extended with the help of Brad. Here are some screenshots of the settings I am currently using. For some reason on my Raspberry Pi 3 I have to unplug/plug in the LittleRP2 via USB, then refresh the setup screen for it to connect via Ramps. I am not sure what is going on there, but it happened on both a Raspberry Pi 2 and 3.
Also, when you connect the default Z-Axis buttons don't play very nice with the RP2 (due to NanoDLP using pulses). So you might want to add a few buttons on that screen to control.
Setup:

Example profile:

Custom Buttons:

Hope this helps!