There really is no "standard" way to connect the shields together. I assume that the center conductors are crimped to a small end fitting that clicks into an edge connector that is screwed to the rear of the avionics tray for the unit.

One important rule is to only connect one end of a shield to ground. You do NOT want the shields carrying current due to small differences in electrical potential at different points in the airplane. "Ground loops" cause all kinds of hard to figure out noise.

Since the assembled radio connector will likely never have individual pins removed, you could leave 1" of shield peeled back from each wire, twist that up, and solder it to a length of bare solid copper wire layed across the top of all of the shields. Then wrap the end of that bare copper wire under one of the nuts that holds the edge connector to the avionics tray.

That's one idea. Most folks just try to make the wiring neat.

I will lobby that you get some wire numbering tape and use it to put a unique number on each wire, then make a little diagram for your records. Will save you a lot of head scratching when you are trying to figure out why something isn't working correctly next year.

Best of luck,

Wes
N78PS