I picked up one of 4Ground's laser-cut Horse Carts in a recent order from Brigade Games; it was so nice I yanked it out of the package the same evening I got it and popped it together.
Here it is as it comes out of the ziplock baggie:

I didn't really time the assembly process, so let's just say "not long at all", including pauses for photographs, faffing around and deciding which caveman to pose alongside the finished cart. It's 15 pieces, in three sub-assemblies, and everything clicks together cleanly and easily with a few dots of glue to secure it.

Finished, the cart is about 3.5" long (2" of body, then the arms/harness bits that hold the horse in place) and 1" tall; 2" wide across the wheel hubs. Just enough laser-engraved detail to make it look nice, and the price is great, especially compared to resin or pewter carts.
There's some more details over on the Warbard.