^^^ in cases where colas grow tall and lean or the plant out grows your frame, using a secondary (larger mesh openings; 6" works well with most plant types ie. nylon horti trellis) helps keep things in order and vertically positioned. I build pvc pods now a days, and always leave a fitting that will allow a second frame to be attached. A 4' frame ends up with a 5' trellis. Then when the horti trellis is being added, it is layed on with overlap so that the extra hanging over the frame can be attacted to the lower frame "caging" the canopy. With the larger size mesh, and only 4' max frame size, reaching in is not an issue. The "cage" design if effective at cradling the loose branches.
Then to jazz it up even more
I plumb the upper frame with a line for injecting CO2. The frame has holes at the cannopy but is all sealed below making the perfect CO2 halo. I am working on a fog system now, that will emit from the upper frame too.
Enjoy.