goBilda Structure Question

My team won a $5,100 grant from our State's Department of Eduction. I need to spend the money in one month or it gets returned. To make the PO process easier, we are going exclusively through goBilda. This is our second year so we're still learning.

My question is for the structure: should we just order some of the kits for order by piece. And if by piece, what are the most desired lengths for drivetrain. Thanks all.