1)
These containers (I think). If they're the ones I recall us having, you can fit six in a tote and it lets you carry parts to competitions just like they are in your shop. Major key.
2)
Worseaframe. Dirty trick, but it worked for us.
3) Clecos. If you build with rivets (and you should), you will wonder how you ever built without them.
4) A bench top 12V power supply (or even just an old robot battery) does wonders for getting your programmers up and running. Stick it all on a piece of plywood and get them busy.