Abstract: A heat-conductive honeycomb ceramic spacer having an array of apertures for facilitating assembly of a semiconductor device including a plurality of semiconductor stacks using a low-profile contact comprising a foil with raised portions corresponding to the locations of apertures in the ceramic spacer for forming contacts with the semiconductor stacks when the spacer and the stacks are sandwiched between the foil and another conductive sheet. Use of such a foil also allows disconnection of defective stacks in the device. Extra stacks are provided to compensate for defective stacks, according to an n-x design philosophy. Solder preforms may be included on the stacks and enhanced connections made to the foil of conductive sheet by causing reflux of the solder preforms. The invention may also be applied to multi-layer device constructions.