I think Kaysie Lackey has a tutorial for birch bark cake on Cake Masters. You'd have to pay, but it'd be worth it. Not sure if it was a crooked cake though, so you'd still have to get help on that aspect. 

I'm actually doing my first crooked cake this weekend - I don't want to give you any pointers as it might all just go wrong, I am kind of making it up as I go along...yikes. I do know that there are not many, if any, crooked cake tutorials out there. I think Colette Peters explains it in her book Cakes to Dream on - I haven't got it and couldn't borrow it but maybe you can get it somehow.

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Thanks Lynne--looks like I might be worrying about nothing....Sharon just doweled it also..

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I am building mine on top of a centre dowel which I have hot glued into the cake drum and out below a bit. I worked out where all the holes had to go in the base boards for each tier, and made the holes just a tad bigger in diameter than the centre dowel. Filled the cakes, ganached them, fondanted them. I stick my cakes to their bases with ganache, and that plus the ganache crumb coat + fondant will, I hope, be enough, to stop the cakes sliding off. I will hammer a couple of skewers through the tiers too, once it's stacked. But basically, if your cake is going to slide, nothing will stop it... I am driving 3 hours to deliver but will take it unstacked and stack at the venue.