One more reason to love hot hide glue. When I went to put the bottom of the first tray in the box, the top runners were a silly mm too wide. What to do, what to do? After running through all the options the best and easiest was to dig out the heat gun and a wet rag to undo the glue up. No harm no foul, cut about 6mm off the runner and re-glued 'em. Anyway, I'm stopping at two trays, both about 250mm deep. Tomorrow I will finish the trays and start the lid.