Welcome and congrats on your first snake. You came to a great place to learn from some great people.
I like your ingenuity, however, I would focus on getting the basics down first. Study the stickies on this forum about husbandry and develop your setup to follow the stickies.
Unfortunately for your enclosure addition, BPs are terrestrial animals who rarely climb. For a great example of this, try setting your snake on the back of a dining room chair with spindles to climb on or something similar. Watch how quickly your snakes starts climbing down, they prefer to be safe and sound on the ground.
Also, that enclosure would be very difficult to maintain proper temps and humidity.
Again, I recommend looking over the basic husbandry info on this forum and keeping it simple. BPs can be finicky, and sticking to the basics is a good idea, especially for beginners.
We're here to answer any questions you may have.