Rowboat? It looks as though someone took a long rainsoaked skateboard ramp, tore the plywood apart, and haphazardly hammered it back together. "Rowboat" is a randomly chosen noun to describe it. "Unfinished treehouse" would also have worked. Or maybe "display case in progress." How about "nearly firewood"?
But really, the first thing I thought of was the Simpson's episode when Homer becomes, for a brief moment, a darling of the Art World. At a show he presents this work: