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Lights mount on an aluminum strip on rear beam. Rear beam can be slid fore/aft, within reason.
I fished new wires through the frame, out the end,(protected by wire loom), then tucked the loom into the channel in frame, secured by tape, then to light fixture. It probably would have been better to drill a hole in frame,just beside light, & insert a grommet.
For the skeg hull Nacra's I just use the rollers. For other more fragile hulls, I use a cradle dropped onto the roller, That was a very good idea I poached from Dogboy.