DS has to construct a Viking longboat that will be used in a race across a short stretch of water. He's allowed some help (he's in year 3), so, on the advice of staff at our local Hobbycraft store, we made a mould out of oasis, then he cut up rolls of plaster and laid the plaster around the mould. He's painted the boat plus made a really nice red and white stripey sail. We stuck the mast on the boat with some plasticine today - and when we tested it in a sink of water, the bloody thing capsized and sank. It's also clearly not waterproof.
I hold my hands up that I am not at all crafty, but given the excellent help that was given in this section recently about a model plane, I was wondering if anyone has ever done this before and if they had any advice. We have 2 days to make a new and better one!