I'll give it a shot.
To build a connector, cut 3 pieces of garden hose, each about 10 inches long. Lay those 3 pieces against each other like an asterisk. Punch or drill a hole through all three hoses at the center of the asterisk, put a short bolt through with washers on each side, and fasten tight with a nut. You now have your hub:
If you choose your hose and strut conduit right, the hose will slide tightly over the end of a piece of conduit.
Apart from that, it's a standard dome layout. The difference is that rather than flattening the ends of the strut conduits and bolting them together for a rigid hub, you just cut the conduit to the appropriate length and slide each end into a hub:
There is obviously more play in a hub created this way than there would be with a rigid connection. My guess is that's only a major issue if there's enough play to allow a section of the dome to invert, and so is less likely with lower-frequency domes.
The hose/conduit fit is usually pretty tight, but will pull apart. Duct taping the edge of the hose to the strut adds some strength, but if more was needed you could drill a hole and put a pin through each hose/strut connection (so the pin would have to tear through several inches of hose in order to separate the two).