A quick update....
The partitioning for the 7.7 is very similar to the 7plus.
I have been in contact with the garyd9 who ported CWM to the 7plus and he has given us a few pointers including his github username.
Interestingly he says that it's likely that the samsung's kernel source release will not have the correct defconfig so we are going to need to tweak it.
The recovery binary gets compiled from the Cyanogenmod sources which are easily obtained.
Unfortunately I'm going to be tied up with my day job for most of this week but will try and look at this again on Friday.
Is there anyone that can keep the ball rolling while I'm busy?