similar stage of construction "similar stage of construction" means a stage at which— (a) construction identifiable with a specific yacht begins; and (b) assembly of that yacht, comprising of at least one per cent of the estimated mass of all structural material in respect of the yacht, has commenced; PU(A) 379/2003 - LANGKAWI INTERNATIONAL YACHT REGISTRY (REGISTRATION OF YACHTS) REGULATIONS 2003 2. Interpretation.