Blotz do a River Barge, which is a suitable size to take one unit of Oathmark infantry, here shown with a 5x4 sabot stand of Human Archers.
As can be seen, the kit is made from MDF.The kit contains two full size MDF panels and a smaller panel.
There are two dowels, one foe a mast, the other for a gaff, a boom or a crosspiece depending upon the period being modelled. There are fittings for a boom or a cross piece.
Assembly is simple, though it is worth checking the online instructions.
The MDF construction is very obvious with gaps between the panels.
Under Oathmark rules, this would be classified as a small ship, capable of carrying one full size (20 figure) unit. The foredeck is quite spacious and I would be tempted to add a light artillery piece (and crew) with the additional two ship crew to upgrade it to a large ship.
It will happily take a Renedra 5x4 rank sabot base.