no reason to be sorry lol
This is where I got half of my ideas is asking. If you go to home depot they make all kinds of pvc and abs pipe fittings that work well for the tunnel to the bottom tub if you do it that way. The white that is lining the cage is called thrifty white panel board at home depot a 4 x 8 foot sheet is 11 dollars and it is an acrylic and water proof. They can cut it for you. The glass tracks are called Track and guides and are by knape and vogt on amazon.
I think that is all the obstacles I had to overcome. Make another post if you have questions and take pictures!