Going bioactive first time old keeper

[Pandora08]

Hi there, hoping someone has some solid advice!!

I've had my darling Pandora for 10 years now, nic boa 4 1/2 to 5 ft long in a 4L×18D×21H aquarium. Very clean. Very protective momma brooding over her constantly.

What I'm interested in is what the heck am i supposed to use for adhesive to glue styrofoam! I have been researching for years but have been too chicken to do it, but finally have the time and money to do it. One video was saying the loctite quick grab worked for gluing Styrofoam together. So I got that. Makes sense.

But sealants! The aquarium sealants I figure are safest. If they can keep fish alive and happy then a boa with humidity and heat should be fine... But I have such a problem believing it. also kinda pricey doing 3 walls of an enclosure... One guy says that the GE 100% silicone 1 is great, another says only use aquarium glue, another says acrylic water based sealant, another says polyurethane, then one guy says flex seal aquarium liquid coating is safe and non toxic..... Oh and another says gorilla glue is great! What!! I can't figure out the correct way to seal this thing..

What I want to do:

Styrofoam model of Angkor Wat with trees and moss and beautiful things among a fallen empire and a water realm with waterfall for her to bathe/drink in the utmost glory she deserves! Mainly, Styrofoam snake-safe Styrofoam creations, towering over puny human-sized buildings to sleep in like the beautiful goddess that she is. Moss dripping down over the sides of buildings, crawling up the walls, beautiful clematis flowering up the walls of her enclosure, maybe some crawling ivy, and some baby tears covering the ground. Baby tears might be fragile for her heavy butt, but hey, its baby tears. Why wouldnt it work. Some pothos on the side, the ability to climb up to higher branches of trees and some ledges to sit on since she really likes climbing higher for some reason.....

Bottom line of what I'm asking- I know it was a lot but its my first post from months and YEARS of frustration - WHAT should I use HANDS DOWN to seal the sculpted styrofoam, coated in 3-4 layers of grout, THEN painted with acrylic paint and finally sealed with.......??????????

Also is loctite quick grab ok to bind styrofoam chunks together if aired out long enough? If so, how long should I let it air out!

Basically, I'm worried that if I make this beautiful, earth-like enclosure for her, finally, after years of debate and stress, that shes gonna die. From some stupid chemicals or something that I did wrong. And I don't want that obviously. She is the best ambassador snake, turned quite a few haters to lovers over the years with her. I would rather keep her in a simple sterile tank to keep her alive than introduce something based off mainly my taste that will shorten her life.

Any and all advice is so greatly appreciated, I am just so cautious of her because she is my first and only reptile and worry about causing her harm. As any pet owner should be, I think