So many points raised...so many questions to answer!
It's 10" diameter (25cm) x 4" deep (10cm)
The owl I'd spotted, the rest of the menagerie I hadn't, so ease up on those tablets, Graham!
I rough turned it down to a 25mm wall thickness and put it into a box of bone-dry shavings on 3rd May, recording its weight on the side. It was then weighed and the shavings changed every week. By 18th July it reached weight that it stuck at for the following 3 weigh-ins, so I finish-turned it about ten days ago....I'm sure it'll be fine.
The surface texture is really, really fine. You can't see open texture on it, but it does have a lovely feel which is distinctly different to the hard, glossy finish on the inside and on the rim. The beauty of it is that although textured, it will be functional and its touchy-feely-factor can still be experienced even if it's full of fruit or whatever.
This was very much a suck-it-and-see experience (who can remember the old gob-stoppers that first gave rise to that saying?). I think that we sometimes have too fixed a view on what texture is.....a surface does not have to be deeply textured to have a 'texture'......in this case I think that there is sufficient texture on this bowl and that therefore, you CAN texture sycamore. That doesn't mean that I don't want to dry deeper textures - I do, and I accept what you're saying, TWiG, about the coarser grained, ring porous timbers being a good substrate......I'm going to try it on a big lump of acacia next.
Les