Sheet metal vs Tubing Chassis

[philso]

Make sure your new sheet metal vendor can supply you the parts WHEN you need them. One of the local teams showed up at a tournament with their competition bot in the bag and only half built. Their sheet metal vendor gave them the parts the day before bag and tag.

[asid61]

I would do a tube frame and save the sheet metal resource for superstructures, personally. Making a WCD nowadays takes very little time, and for us at least it makes more sense to go with that rather than use our sponsor's time making the chassis for us.
However, having flanged sheet metal for superstructures is very lightweight and nice IMO.