There is a 1/700 kit of the class by HP Models available:
http://www.hp-models.com/index.php/shop/schiffe/waterline-1-700/world-war-i/kaiserliche-marine/mine-cruiser-brummer-1917-detailhttp://www.hp-models.com/index.php/shop/schiffe/waterline-1-700/world-war-i/kaiserliche-marine/mine-cruiser-bremse-1917-detailThere is a plan of the class drawn by Klaus-Peter Schmolke (Planmappe: Kleine Kreuzer 1903-1918: BRUMMER-/BREMSE-Klasse), but I do not have it and therefore I do not know, if it is useful.
There is a Russian article in Morskaja Kampanija N°2 2010 about the class containing many photos and drawings.