Our team makes a lengthy pre-order before each season. Our pre-order includes electronics, sensors, and tools that we are interested in using during the season. Keep in mind that the electrical system varies little from year to year, so you can almost pre-order the entire thing.
In addition this year, we CADed our drive train in advance, so the materials for that are on our list as well.
Here is a link to our pre-order if you are interested.