Ian McDonald and Rob Wilhelm are not building an understated new home. Theirs is a Grand Design in its most literal sense. A glass box with a roof like floating wings overlooking Port Phillip Bay on the Bellarine Peninsula – seven bedrooms, seven bathrooms, cinema, games room, glass lift, glass panelled pool, rooftop garden – all the bells and whistles, all the boy’s toys. With a construction budget of $1.8 million, the question is will they burst the budget banks and by how much?