It is an easier task for SM-P605 since it uses S800 CPU which has open source-ish drivers which can help devs a lot while compiling a rom from source. Looks like nobody wants to take on this yet since it requires lots of time and knowledge

SM-P600 & P601 & P602 are a bit unlucky since they use Exynos CPU's which we have less source and experience on. Somebody can port from Note 3 with experience in porting (should be easier than building ground-up drivers for now).