ok well i downloaded a few ROMs for various rk2818 roms..and all seem to work with varying results..
i DID NOT just flash the ROMs as they are, i only replaced boot.img and system.img..
keeping the Kernel.img, misc.img, and recovery.img from my original dump...(i did try a few kernels from the ROMs but all of them locked up pritty much soon as they are powered on..
i may post a few of the better ROMs i have converted over (some required new TSCalibration.apk, gapps, and a few other apks i always use)..but again you will probably want to edit them to keep your own kernel (i know my kernel will work ok on most of the 2nd gen pads, but wont work on the 3rd gen 4gb pad)
i have a few images of internals of both 2nd gen and 3rd gen pendos for comparison aswell, they aint the best quality pics, but they show the vast differences..ill post them as soon as i can
from looking at the internals, it looks like its quite possable to hardware mod these aswell, there are ports on the board for bluetooth and vibrator, and maybe even GPS (3rd gen has it but i couldnt find it on the 2nd gen), both should fit in the case pritty easy (jaycar sells phone vibrators of differnt sizes, they prolly sell small laptop type bluetooth too)