Control panel for Kossel mini 20х20

This is a simple control panel for Kossel mini printer.
It consists of:
- OLED display 1.3'
- Encoder
- SD card reader

For more details - see images or just ask ))

11.11.2015 Update
Seems like Marlin can't normally work with Graphic LCD in Delta mode.
I lowered delta_segments_per_second to 80 and it still have some pause during prints...
So, it looks great, but doesn't work as I expect ((

Need more powerfull hardware like arduino duo...