Inside Cage Design

My red tail boa Chloe is 6ft and lives in a 6ft x 2ft x 18 inch Vision cage, sliding glass doors on the front.
Since this will be her forever home, I have been thinking lately of giving her some climbing space, such as pvc pipes going from floor to ceiling and to the side and back of the enclosure.
I am not sure how I would attach it to the cage, since the cage is made of polyethylene, I doubt that silicone would be sturdy enough to hold it all together. I don't want to drill into the cage unless I know this will work and become a permanent, attractive,usable part of the cage
I have read the threads on taking a torch to the pvc, I would do this as well, or use the great stuff and put vines around it, painted to look tree like.
I just need to know how to secure the pipe to the cage?

I've never really been a fan of fake branches but use them in short term set-ups. I have a pair of solid cork branches in with my Colombians they are fairly large and support one another with out fixing them to the cage in any way. I used cable ties to secure them to another just in case they tried to slip apart. Best thing is cork is the two large branches (Each about 4' and up to 5" round) were only 20 Euro (about 30 USD).

Unfortunately I haven't been able to find anything like that, the closest I can come right now is taking a hike out into the woods (when it dries up)and seeing what has fallen through the winter, and trying to drag it back to the truck.
Large enough pieces of driftwood are expensive around here, and then trying to haul something that big to the upstairs bathroom for a soak would be a tough job.

Silicone is quite strong.
I'm not sure how it would adhere to the poly. Perhaps try a small area.
There are products such as "Plumbers Goop" which would hold it but I think the VOC's would be quite high.

If the silicone sticks perhaps cut a hole and stick the pipe through the side to get more strength.

Is there a way to get the pipe to stay if I cut a hole in the tank? like a screw cap or something? Not much of a plumber so I don't know too much about PVC I could probably con my brother in-law to cut the hole and pipe for me, but I would have to have a definite plan first,as he has tons of projects already going on(remodeling the house)

I just think it would be better for Chloe if she has the option if climbing instead of always laying on the bottom of her cage,I would get plenty bored.

I think you'd want the pipe fairly secure so it's shake too much.
If you stuck it through the hole, you could glue it with something on the other side. Or get a slightly large piece of pipe to slide over the end and secure it against the hole.

Is there a way to get the pipe to stay if I cut a hole in the tank? like a screw cap or something?

That might actually be the best idea! There are PVC caps that fit on the different sizes of pipe. If the pipe protrudes out the side of the enclosure you could use the PVC cement to attach the cap top the end of the pipe holding it in place. The only concern I would have with that is that the walls of the enclosure were thick enough to support the weight of the boa moving around.

I think the cage is extremely sturdy, I was thinking that if I put the pipe going from top to bottom, on the far left side then branching one or two pipes to each of the side and back wall would make it nice and sturdy.
It is model #632 Vision Products