Hi! First I want to thank everyone involved in creating the wonderful software package we call Xlights! My show (first year) is a BIG hit in our community! There are currently over 10 cars lined up in front of the house, and it's only the 18th day I've been running the show!

..but anyway, I'm having trouble trying to create a single model using 2 different sets of channels.
I'll try to explain. My windows frames have a center section, and are wired in an "S" pattern. Maybe in hindsight this wasn't the best way to do it, but it's too late now!
I've attached an illustration of how they're wired.
My big question is: How do I create a model for the LEFT and RIGHT sides of the window? The upper & lower sections of each side consist of 2 non-consecutive groups of channels that go in OPPOSITE directions.
I tried a CUSTOM model, but it won't allow me to check "Individual start chans".
I tried using a "single line" consisting of 2 "Actual # of strings", but the there's no way to specify a different number of nodes for each string, and no way to specify that the 2 strings go in opposite directions.
I also tried matrix, but still the same issues as above.
Am I missing something simple?
Surely there's a way to do this.
Any suggestions would be greatly appreciated.