I don't have any T70's that's more of a retic size, I've got several T8's and I like them just fine but if I were to do it over again I'd get the sliding doors with locks.
Ive got a couple burmese pythons i need to recage, trying to find someone who has one to see how sturdy they are. I have a A30 for my frilled dragons and the back panel is very flimsy and its 6'x4' so im a bit nervous about putting a 150lb snake on a 8'x3' panel and stacking 3 of them on top of each other
I think Ben Renick uses the AP cages. Most people don't need anything larger than the 6' version even for Burmese. They are built for stacking and for Large Constrictors. You don't have anything to worry about.