Kees
Well, yes if you want to make the handtool look obvious, you need to add some typical design elements that are best done by hand and try to put a bit of "schwung" into it.

Then there are of course the hidden clues, like the rough backboards, the gaping shoulderlines on the inside, the secondairy wood like pine, all those things you see in antique cabinets.

And then there are the subtle clues like Brian described, the wood choice, how the wood is used, the panel thickness etc.