Large Polyethylene Enclosure Upgrade Opinions Needed

[Squisher]

After having various types of enclosures and the downfalls that come with them i.e glass is hard to maintain required climate levels (used aspen doesn't work with the big guys for impaction dangers during feedings).. Built a wood/plexi enclosure which took too much to heat and can be hard to clean. Polyethylene Enclosures like Boaphile and Vision Products help a great deal with all the above. I currently own a few Vision Cages however since i did not order them new they are not perfect for my needs. For one they have no provisions for flexwatt and it does not have a drop in heat source which would make it easier to stack them. What they have is a long step-like vent across the back. In order to heat the bottom enclosure with CHE and be able to stack another enclosure on top i had to shim them to clear the ceramic socket. Since i am in need of a larger enclosure for my adult male retic i was wondering if anyone else uses a large polyethylene type enclosure and what types of heating and (continued..)