I love these models! So quick and easy to put together. :)
These carts are made by http://www.4ground.co.uk/
Once I've put them together (with superglue), I like to give them a wash of PVA to create a sealed layer.
Generally I've been keeping them in groups of parts, to make painting easier.
This literally took 1/2 an hour to build. With some oxen from Perry miniatures (best VFM IMO), it would look the business.
Here's another oxcart I've been working on. The cover is made out of Rizlas (cigarette papers) soaked in PVA water.
The only problem I've had so far is the wheel rims are very fragile on the smaller cart, and could do with being moved in 1/2 a mm or so.
Other than that small gripe, the models are very well designed. The tolerance of the cut is fantastic, with most pieces fitting with friction alone.
The glue is almost an afterthought.