I have both rats and soft furs in these racks which are simply covered by thin plastic that goes from ceiling to floor. Behind the racks is a small window exhaust fan. Before I did this the rats and soft furs stunk up my house. Since then I promise it is nearly impossible to smell the Rodents. Now I just lift the plastic get what I need or clean and feed and then put the plastic back down. It has literally brought the smell down to nothing.
It is very difficult to introduce adult soft furs at all. Whether there is a litter down or not. My best luck is introducing in groups on clean bedding when the soft furs are under 4 months old.
I am in the very southern tip of North Carolina, so its hot here in the summer and mild in the winter. Neither my rats or soft furs would survive the summer here if they had to live outside in these racks. They would roast. And even if they didn't die there is no way they would produce many young if at all. Maybe your ASFs are better acclimated, but I lost about a dozen breeders last summer when my a/c went out for 2 days in July when it was pushing 100.
I don't feed any balls soft furs. Even my hugest balls being in the 3000 gram range can barely eat a medium rat let alone a huge breeder. I usually sell them to a buddy who has boas and retics.
I totally think that soft furs are way better than rats. They smell less, breed more, take up less space and stay the size I need for longer, but at this point I have decided it is easier to raise a few rats so as to not alienate such a large portion of potential customers.