Look very neat and clean, however, I do have a couple of questions…
Why are you using two Digital Sidecars when you only have 5 speed controllers, unless you have a lot of Digital Inputs, relays, or more speed controllers, two DSC’s seem a wee bit unnecessary if you asked me. You could save a decent amount of weight by getting rid of the module, the cable and the DSC itself if you don’t need it. The same applies for the second NI 9201 and the NI 9472. If you aren’t using them, get rid of 'em. Just a bit of advice.
It looks very neat and clean though, best of luck this season.
Why are you using 12 wheels? That won’t increase the friction, it seems a bit pointless, doesn’t it?