Bad news about your car planks, I hope the culprit pays for it one way or the other!
If you do go back to this then you'll need to leave spaces around some of the letters in the corner (if you go with my 'double-cross' interpretation) or maybe form a circle if you opt for the other one s_pugh mentions?
s_pugh - there's no need to apologise, you certainly didn't mislead (in fact you gave the right answer - I was only offering a further hint).