My plan was to group the arches by 2 (left and right), start in the middle and wire the inside arch from the middle to the left, then the outside arch from the outside back to the middle, then mirror that in the right hand arch. 25 pixels per arch, 100 pixels per 2 double arch (then have 4 double arch sets for 8 total double arches. I know that sounds confusing., picture attached. One of my goals was not to cut a 100 pixel string.
The reason I say it wouldn't wire right is I do not see a way in xlights to patch models intermittently. 1-25,51-75 on one model but 26-50,76 to 100 on a different model.
As I wrote this I figured out another way. 16 different models would also do the trick. A bit more work but probably doable.