Uhh, the ending with the planks isn't something you should bother loosing sleep over. While I can understand wanting to know how many planks you've already got and such, the whole point with the planks is being hard to find. Heck, why have an achievement if you can just turn on a crutch to give you all of them regardless?
But as I said, the ending doesn't really add any amazing gameplay wise, so don't worry. Otherwise, touch wood