Well, just for starters, consider your target device (the 700). It has totally different HW, of which you propably know nothing about. How are you going to write drivers for it without specs? (it's closed HW, no sources, no datasheets, no schematics on how the cips are wired together...) Even to get just barebones kernel (just a serial console, or maybe not even that) running on it is tricky as the bootloader is secured. You would first need to find a bug that can be escalated to system breach and feed your bootloader through that. Just forget it.