You can use duct board. It's insulated on one side and and silver backing on the other.Comes in a 4x8 sheet and can be used to make reflectors for HID lights as well.Figure your design out and cut peices then use the foil ducting tapeto tape the peices together.You could make more than 1 from this sheet. That backing will really throw the light back at the plants. A mind is a terrible thing to waste! Don't waste ya mind,GET WASTED!

Ga Grown!