There was a guy, I think on a YouTube video, that had the same set-up. You never think about it, but draft is draft no matter where the opening.
I've played with idea of ordering a Guru adaptor and mounting it to my BDS for winter cooks. I would need some kind kind of S shaped tube, either outside or inside the cooker, so the fan would not be right on the ground (and in the snow). I haven't done it because it works so well as is.
A bigger side table, maybe removeable, is next on the list.
KCBS - CBJ
Big Green Eggs, Big Drum Smokers, Big Chiefs, Weber Smokey Joe "Custom Tall Boy"
Oil Patch Horizontal
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Barbecue is not rocket surgery