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156: 3 bulldozer-heptacubes, 3 hanger-heptacubes, 3 wrench-heptacubes
1 solution for B, 2 solutions for A and 3 solutions for C
3×
3×
3×
empty cube at B
empty cube at A
(1 of 2)
empty cube at A
(2 of 2)
empty cube at C
(1 of 3)
empty cube at C
(2 of 3)
empty cube at C
(3 of 3)
3× 
3× 