High precision, low detail blank models of ATX, microATX, Mini-ITX, and HPTX form factor motherboards with mounting holes and IO opening + standard single/dual slot and low profile PCIe cards in their proper relationship to the motherboard. All dimensions from official specs.
Model created by subtec. Uploaded with permission.
Editor's note: I can personally vouch for the accuracy of this model. Project Nova was designed around it and the motherboard, IO shield, and cards all fit perfectly.
SketchUp model and my conversion of it to .STEP included.