Here's some other future mods ... maybe

1. With a little pre-planning and perhaps some larger diameter PVC you could actually run all your wiring, and perhaps even hydroponic lines for an ultra clean, no tripping-over-everything look.

2. Since the frame is PVC, it could be used as a water delivery system itself

3. Heavier PVC -- stronger cage. Mine is in the corner of a room, so has two walls supporting it. Still, it's fairly stable on its own. Heavier PVC also creates more stable mounting areas for fans, shelves, or whatever.

4. With more room, I'd probably create a peaked roof and cover it with Mylar.