Adjustable support system for a building structure and a wall structure having an adjustable support system

A method of assembling an adjustable support system comprising the steps of:

• providing at least a pair of base bracket system assemblies, each of the pair of base bracket system assemblies comprising:
• a base bracket member having a first end wall structurally attachable to a substrate, a body wall extending outwardly from the first end wall at an inner edge thereof, the body wall terminating at an outer edge;
• at least one clip member having a projecting arm extending from a region proximate the inner edge of the base bracket and overlying a portion of the body wall;
• with the projecting arm being biased against the body wall;
• providing an outer bracket member having a spanning wall with an inner side and an outer side, with an outer end wall extending from the outer side of the outer bracket;
• and
• slidably positioning the spanning wall between the body wall and the at least one clip member, so that the at least one clip member and the body wall sandwich the spanning wall therebetween thru the cooperation of the body wall and the at least one clip member applying a force against the spanning wall.