This document provides an overview of the relevant design parameters for a novel X-rotor shaped wind turbine at a representative North Sea site, focusing on the structural design. This includes a definition of environmental conditions, as well as of the scope of the design and how it will be verified. In order to facilitate comparison with previous design efforts, the site conditions and design choices have been adapted from work performed for the DTU 10 MW offshore wind turbine and the UpWind design basis.