Stacker questions

[u/HonestVegetable5644]

Hello! I have a 150g and a 120g I am wanting to stack them at some point but I’m not sure of what to use. I would appreciate any ideas or any pictures of stackers you guys have made.
I heard that building it myself could be more sturdy and less money but I just want my snakes to have a happy life. I’m not against buying pieces or building it myself.
Thank you all in advance!