After having been through my first round of grafting, I'd say you need something that can easily expand as the joined stems begin growing thicker. That's the beauty of the silicone clips -- they easily expand so they can be left on until the graft is 100% healed and able to sustain "weight" without a brace, which seemed to be about the time the clip would be completely pushed off.
As for the humidity chamber, it can be as simple or as complex as you like. Mine was a 1020 tray and a humidity dome with adjustable vents. These helped slowly reduce the humidity over several days until I could completely remove the dome. I know others simply use plastic tubs with lids and just slowly crack them open over time. Online I've seen bigger set ups used by more commercial scale growers using frames, plastic sheeting, and humidifiers.
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