Looks about the same size as mine, 18" square, which I had thrown in with a Mitutoyo 24" height gauge... (for 40 quid / 50 dollars, small gloat)
I hope you're going to make a cover for it, if it doesn't already have one!
The dividers - are they the Ikea "Stodja" cutlery trays? They look pretty good!
Dave H. (the other one)