Each module comprises at least three elongated, equally long leg components (2a, 2b, 2c) which are mutually coupled by means of connecting components (2j, 2k, 2l). The length of one leg component (2a, 2b, 2c) in a module is in a predetermined relationship to the length of a leg component (2d, 2e, 2f, 2g, 2h, 2i) in another module. - At least one of the leg components (2a-2i) and/or connecting components (2j-2o) is hollow and forms a storage container for fuel for motor drive of the power plant. The length of a leg component in a module is directly proportional to the length of a leg component in another module. The length of a leg component in a module is greater than the length of a leg component in a module closest above it with a factor between 1 and 2.
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