At the Reptile show last year, this guy made his viv with sliding doors and between the doors, he placed a strip of door weather stripping made of foam rubber with a sticky backing. I’m sure it made a deterrent.

As for the flexibility of the door “if”, it becomes and issues try gluing a strip of hardwood on the outside of the most outer door.

I do like the configuration access from the front. I keep reading that the ppl on here with viv that open to the front, seems to make the snake more at ease. Something I need to look at when building my next unit with a water feather for the Puget’s.