From their announcement:
The first release in our all new Castle Winterhawk model series, The Watchtower is a 28mm scale defensive fortification. This model includes alternate parts to build a complete tower or a ruined, crumbling structure perfect for wargaming and RPGs. Our Dragonlayer enhanced files allow you to customize the texture art before printing, allowing you to add ivy, foliage, snow and icicles to your tower. The Watchtower comes complete with a detailed interior, stackable levels that can be added to so you can expand the height of the tower to your specifications and much more!