A tool assembly, comprising: a support frame, support beams, and support mounts, the support mounts supporting the support beams, the support frame being rigid and used to transport the tool assembly; and a support tool for aircraft parts, supported by the support frame, the support tool comprising: a faceplate and a supporting grid structure, formed with the faceplate as a monolithic structure; and metallic and/or fiber components embedded in the support tool to enhance structural stiffness to maintain dimensional stability during support tool handling and transportation, wherein: the faceplate and the supporting grid structure are defined by a series of additive manufactured, AM, layers, built on each other; the supporting grid structure is positioned below the faceplate and supporting the faceplate; the faceplate comprises a supporting surface at a top of the support tool for supporting a working component; and the supporting surface is contoured and defined by a well, formed in top-most ones of the AM layers; the supporting grid structure engages the support beams such that loads are transferred between the support tool and the support frame through the support beams; and the support frame maintains dimensional stability of the support tool during transport and when resting within an allowable tolerance of the support tool. a support frame, support beams, and support mounts, the support mounts supporting the support beams, the support frame being rigid and used to transport the tool assembly; and a support tool for aircraft parts, supported by the support frame, the support tool comprising: a faceplate and a supporting grid structure, formed with the faceplate as a monolithic structure; and metallic and/or fiber components embedded in the support tool to enhance structural stiffness to maintain dimensional stability during support tool handling and transportation, wherein: the faceplate and the supporting grid structure are defined by a series of additive manufactured, AM, layers, built on each other; the supporting grid structure is positioned below the faceplate and supporting the faceplate; the faceplate comprises a supporting surface at a top of the support tool for supporting a working component; and the supporting surface is contoured and defined by a well, formed in top-most ones of the AM layers; the supporting grid structure engages the support beams such that loads are transferred between the support tool and the support frame through the support beams; and the support frame maintains dimensional stability of the support tool during transport and when resting within an allowable tolerance of the support tool. a faceplate and a supporting grid structure, formed with the faceplate as a monolithic structure; and metallic and/or fiber components embedded in the support tool to enhance structural stiffness to maintain dimensional stability during support tool handling and transportation, wherein: the faceplate and the supporting grid structure are defined by a series of additive manufactured, AM, layers, built on each other; the supporting grid structure is positioned below the faceplate and supporting the faceplate; the faceplate comprises a supporting surface at a top of the support tool for supporting a working component; and the supporting surface is contoured and defined by a well, formed in top-most ones of the AM layers; the supporting grid structure engages the support beams such that loads are transferred between the support tool and the support frame through the support beams; and the support frame maintains dimensional stability of the support tool during transport and when resting within an allowable tolerance of the support tool. the faceplate and the supporting grid structure are defined by a series of additive manufactured, AM, layers, built on each other; the supporting grid structure is positioned below the faceplate and supporting the faceplate; the faceplate comprises a supporting surface at a top of the support tool for supporting a working component; and the supporting surface is contoured and defined by a well, formed in top-most ones of the AM layers; the supporting grid structure engages the support beams such that loads are transferred between the support tool and the support frame through the support beams; and the support frame maintains dimensional stability of the support tool during transport and when resting within an allowable tolerance of the support tool.