As requested by some members of this thread, here's some photos of the snoot I made for my Z-240. The optical cables were made with Loc-line hose system and the optics use 8mm optical cable (might be wrong on the size, can't remember exactly) used in swimming pool lighting systems. These gave me much greater light output then the smaller sized packed cable to where I can now shoot at f32!
The optical lines attach to the Z-240 using a system made from 4" PVC septic tank caps available at Home Depot. They also sell short sections of the pipe you'll need to complete the job. The 1st cap attaches to the Z-240 using the same system Inon uses to attach their diffusers. Since the thickness of the plastic between the two is almost the same, I just sacrificed an extra diffuser I wasn't using and removed it's stainless screws, installing them on the cap, rather than locate the custom hardware someplace else. I also drilled several holes to allow for heat and trapped air release on top and bottom of caps, then painted the inside flat black so light would be so widely dispersed through these cooling holes.
The 2nd cap hold the optical lines. I made 3 recievers since I wanted a modeling and focus light with this set-up (2 for the 2 flash tubes, and 1 for the LED). The blue connectors I came from a Philippine hardware store, so I'm not sure where you'll get their counterpart in your country. Basically it's an plumbing adapter that has a 1/2" male screw end and also a 1/2 female end to accept the optical lines which terminate into a 1/2 male Loc-Line connector. This whole system is easily dismantled for transport and put together in minutes on location.
Maybe you might want to trade your custom made Canon port for one of these Edward? :-)
Send me a me a personal message for more details.