Quote Originally Posted by Malsor
you made a good point about the paint. I will paint the walls gloss white and use reflectix over that. How easy is it to make whole's through the reflectix with a hole saw? I don't want to tear it. As for the pots, I been doing a bit research on potting seedlings in cups and in 5 gallon pots and the results are the same.
You can punch holes in it with a nail. Use tacks or a staple gun. It's fairly durable.

You're wrong about going straight into 5 gallon pots. You can do it and you will likely get results but you will get better results by repotting over time. Here is why. You do not want your plant to focus more energy underground than necessary otherwise you sacrifice canopy growth for root growth. With a large pot you end up with stagnant zones of soil that retain water and provide a breading ground for pests, harmful molds, and conditions ripe for root rot. You want the root ball surrounded by fresh, nutrient rich soil. It is important to note that the ability of peat-based mediums to buffer pH degrades over time. As the buffer degrades you may face pH swings and nutrient lockout.

See this sticky on the importance of repotting. I'm going to add it to my signature as I see this question raised quite a bit.