Magnificent, I wouldn't have noticed the mistakes at all. Please may I ask what you mean by 'pay attention to the grain direction? It looks perfect to me.?
If you Google A2 magnetic sheets, it comes up with a lot of options. I got one, it's great, I found that an A2 was big enough for me to cut to the shape of my saw but you can get different sizes.
I got a 'key' for my 21st as did we all in those days, but as has been said it's not 18. I'm old fashioned though and still prefer the 21st birthday key. I got my daughter a key when she reached 21 and she said I was 3yrs too late