With the architect Werner Tscholl, Messner found a kindred spirit for the refurbishment of the castle and the exhibition blueprint. Tscholl is a specialist in castle conservation; his primary objective is to preserve the original. The challenge at Sigmundskron was to preserve the historical walls of the castle and implement the necessary measures in such a way that they can be reversed whenever required. The new architecture remains in the background and serves merely as a stage for the exhibition. The glass roofs on the towers, for example, are not visible from the outside, nor are the various pipes and cable ducts. The architect restricted his choice of materials to steel, glass and iron as being both modern and timeless.