I think if you want to make a display you are on the right track.
Keep in mind, I'm showing you my system and as Josh stated and I'll agree with that statement; There are MANY ways of doing this.
If you have a big collection, or need an efficiency system, my gig is not what you'd want. I have 3 snakes and all are in display cages. I could maybe deal with one more but after that cleaning and looking for space in the room would cause issues.
Pro-Line and AP are excellent choices. I prefer HDPE plastic and a single drop door. I can get my BIG branches and perches in and out quickly, use a dust pan and hand broom to scoop and dump old substrate and I can shop vac the whole thing out easily.
Prices are not vastly different when you factor in shipping. AP T-8 may be a bit less for a 12" cage, but you'll get 14" with the Pro-Line and shipping is included. It may be a closer comparison with the T-10.
Both are just fine IMO.
Think that should cover it.
Have fun with it. That's what the hobby is all about!