Weld to create an arduino compatible device

Competition Introduction with related photos:
Our idea is to offer participants a solderable, extendible, hackable badge of approximately 10cm x 12cm size. The badge will be provided as part of a bag of components participants can solder to create an arduino compatible device on which we'll run a hacking competition throughout the weekend. Our soldering workshop area  can be branded with PCBWay branding should you  want to do that and the space will be manned by soldering teachers to help persons make their badges. The winners will be those that develop something innovative and interesting at the  event.
Community Introduction with related Community activity photos:

Project Details

The board will be 10cm/12cm - we will provide components separately - here is an example board but this is not final