A frame structure for a cabinet enclosure, comprising: a front frame assembly having a first and second front pillar, with the front pillars each having a front frame fastening surface; a rear frame assembly having a first and second rear pillar, with the rear pillars each having a rear frame fastening surface; a first and second side brace member each having a beam that has a front end edge and a rear end edge, with the opposite edges of each side brace member connected to one of the front pillars and one of the rear pillars, wherein a connecting bracket is provided adjacent each of the front end edge and the rear end edge, each connecting bracket having a brace fastening surface with a fastening member provided on the brace fastening surface; a first connector configured to connect the front frame fastening surfaces of the front pillars to the respective brace fastening surfaces adjacent the front end edge and a second connector configured to connect the rear frame fastening surfaces of the rear pillars to the respective brace fastening surfaces adjacent the rear end edge; wherein, when assembled, the front frame fastening surfaces of the front pillars and the rear frame fastening surfaces of the rear pillars are in contact with the respective front end edge and rear end edge of the respective side brace members, wherein, when assembled, the brace fastening surface on each connecting bracket is spaced from the corresponding front end edge and rear end edge, so that the brace fastening surface for each connecting bracket is spaced from the corresponding front frame fastening surface and rear frame fastening surface. a front frame assembly having a first and second front pillar, with the front pillars each having a front frame fastening surface; a rear frame assembly having a first and second rear pillar, with the rear pillars each having a rear frame fastening surface; a first and second side brace member each having a beam that has a front end edge and a rear end edge, with the opposite edges of each side brace member connected to one of the front pillars and one of the rear pillars, wherein a connecting bracket is provided adjacent each of the front end edge and the rear end edge, each connecting bracket having a brace fastening surface with a fastening member provided on the brace fastening surface; a first connector configured to connect the front frame fastening surfaces of the front pillars to the respective brace fastening surfaces adjacent the front end edge and a second connector configured to connect the rear frame fastening surfaces of the rear pillars to the respective brace fastening surfaces adjacent the rear end edge; wherein, when assembled, the front frame fastening surfaces of the front pillars and the rear frame fastening surfaces of the rear pillars are in contact with the respective front end edge and rear end edge of the respective side brace members, wherein, when assembled, the brace fastening surface on each connecting bracket is spaced from the corresponding front end edge and rear end edge, so that the brace fastening surface for each connecting bracket is spaced from the corresponding front frame fastening surface and rear frame fastening surface.