Potijze Chateau - GHQ Line

[Mansell]

Hello, 

 Can anybody help with this.  I'm trying to find a map or plan showing the trenches as at May 1915 in and around the Potijze Chateau and the section of the GHQ line in that vicinity. 

Also, was the Potijze Chateau ever known as the 'White Chateau'?

I understand more than one large building was unofficially known as the White Chateau, the most well known perhaps that near the Menin Road.

 

Thank you.