The only thing that you will need other than plastic are the magnets (3mm tall, 6mm diameter). There are 63 magnet sockets in total but I used probably 55 magnets.
Dimensions (L x W x H): 217mn x 255mm x 116mm
Cut up for minimal support requirement. I glued the magnets in the pockets with CA clue and it worked quite well, but care need so be taken because any leaks can glue the plastic parts together.