I'm modeling mine after one of those all in one boxes I saw in an article online. You can google it if you want to see, it's called the roommate grow box by bcnorthernlights. The main reason I want to build one of these is I like the idea of it all being closed off in a box and the portability. I'm building my own because I can customize it and not drop $3000 on something that may not work that well. Anyway I'm unsure about what material I should use for the walls. I was thinking about using plexiglass but I heard that it's difficult to drill through. What could I use for the walls, it would be awesome if it was something I could buy at the Home Depot.
Use chipboard. It's cheap rigid and easy to work with. If you buy the white plastic coated chipboard then you have the reflective issue sorted straight away