I thought Lego's Delta-7Bs were missing a few things, but mostly a correctly orientated Astromech socket. I tried to edit in a background, but all I had was gimp, because I'm an Apple person.
About this creation
The First thing I did was add cannons, because LEGO didn't.
But What I really wanted was a correctly orientated Astromech socket.
The socket without the droid
The socket Open with the droid
The socket open without the droid.
Below are LDD instructions for applying the astromech socket mod to any Delta 7-B yet released by LEGO. Note that this is an idealised version and some pieces used may not exist in corresponding colours. Also, wings are missing (because they don't need to be there, and to reduce download size), as well asa any feature on the bottom of the set, as these are also unnecessary, and in some cases obsolete.
If you do not own the sets, it is unlikely that you will be able to build the ship. Please take this into account.