Making a grind box

I've been exploring the design of these basic pieces of equipment for skateboarding. Here are the criteria - it must be:

• portable
• made from readily available materials
• flat on top
• can have a grind rail attached
• can be extended upwards

This is my basic design. The pictures below are only meant to show how the legs would be added and are not the finished design!

Here in Ulverston palettes are the most available free materials - obtained from building sites.

The design requires taking a palette nearly completely apart then reassembling and cutting wood to length

By careful positioning the wood at each end, it allows legs to be added.

To these would be added a further framework to make the legs stable - the illustration does not have this added.

I am offering workshop facilities for children - near the Health Centre - can you offer some in other parts of town?

Would you have a storage for a few palettes?

I now have ten boxes that are ready to go - just need some kids!