Man, oh man. I'm shuddering with jealousy over here, mate.
That spalt is simply gorgeous. So darn lucky. I reckon it would look killer with just a really deep natural finish, to bring that incredible grain right out. I'd hate to see it get lost amongst too much colour. But, as with all builds, it's a very personal experience, and I'm sure whatever you choose will turn out awesome. Keen to see this beauty progress.  
