Thanks all - yes I really enjoyed making it. As I've said before,  make something which holds specific items is a greater challenge, and more fun for me, than an empty box that c,n be any Suze.  Alas it sold as soon as it went to the gallery, as did all the kodsnsu/small chests that I've posted here.
Brian: it's not new, - I did post over there. Ah yes, the splines - no not Japanese.  From what I've seen they usually rely just on the strength of glue on butt joints or mitres.  I did use splines a lot and often veneered over the top to disguise them.  But not good on drawers as any fine adjustment can lead to you sanding through the veneer - I guess a few of us have been there.  Recently on tiny drawers and internal boxes I've just used a mitres and glue. Though I do use a scalpel to score the faces of the mitres so it gives a key for the glue - seems to work, particularly if the bottom is in a well fitting groove.
Splinter  - it's a 12 inch /300mm ruler.
Thanks again boys, it's always good to read your comments and answer your questions.