A tragedy of great magnitude happened to me and I don't want this to happen to others too. I never heard nor knew this kind of thing even existed and if I knew I could have avoided it but unluckily I couldn't.
MY RARE CASE
So my surgeon told me I could have a potential to have upto minimum 6 inch depth but while 'digging' the passage to build my vaginal canal he had hit into some scars formed outside my anal canal. The vaginal passage is created very close to the anal canal. THIS SCARS FORM WHEN SOMEONE IS FREQUENT OR TOO FREQUENT IN ANAL SEX. The worst is you wouldn't even know those things occur inside you as that part of your body doesn't have nerves to alert you. He couldn't dig any further and that had led to a disaster of ONLY 4 INCH DEPTH.

He told me now the only option to have greater depth is to have a Sigmoid Colon vaginoplasty but that costs much more plus very dangerous and risky followed by many disadvantaged as a damp smelly vagina. MY SRS LASTED 12 HOURS INSTEAD OF 6 COS OF THIS.
So here it is, abstain from having anal sex at least 3 months before SRS to avoid these types of disaster.