Well I'd like to build a grow room within a room just like what Sammo has,I'd be doing the framing with 1x4 lumber for support staple with large card board panels painted with white latex paint for the reflective panel.
Well I live in the carribbean where we have a tropical climate,my room dimension is approximately 4ft x 5ft.I'd be mainly using the grow room for maybe one or two plants and seedlings for outdoors in spring