Mark, thanks for referencing the picture.
My intercom is a "Pilot PA 200". The unit has a lead that is approx 4 feet long and is wired with a duel pin plug that fits into a hand held radio. It has a two setting selector switch for the brand of radio it is used with. The (my) Sportys works on the "King" setting. My "hide-away" holder is made from a modified control yoke holder. I DO NOT have a header tank behind the panel so there is room for my radio to swing completely up and behind the panel by simply turning a thumb nut. Other options might be to use a 90 degree antenna connector and put the radio on a "hide-away" mount that drops down behind the forward spar or a panel mount and run the wiring into and behind the panel. I ran out of panel space and because I'm 6'4" and 200 lbs, I didn't have many options. For "average" type pilots, a side wall mount might work also. I originally built the holder to mount my GPS also but that made it a bit too wide and it was touching my legs so I narrowed it down for the radio only. I made a slide in power strip that is wired to aircraft power and slides into the battery position when the radio battery is removed. The power strip has two brass strips that transfer the power to the battery contacts on the bottom of the radio. With the battery removed the radio is only about 4 inches tall. Hope this helps. Good luck. Larry Flesner