Steel vessels are widely used in various industries, such as oil and gas, chemicals, water, and power, for storing and processing fluids and gases. The performance and efficiency of the complex cycle of fabricating and constructing steel vessels have significant impacts on the cost, quality, and delivery time of the steel vessels, as well as the customer satisfaction and competitiveness of the manufacturer. This paper presents a simulation model of the cycle of fabricating and constructing steel vessels, using AnyLogic. The simulation model developed in this paper covers the entire cycle of fabricating, painting, and constructing steel vessels, from material procurement to final testing and delivery. The model incorporates real-world data from a case study of a steel vessel manufacturer, in addition, the model aims to analyze the current performance and efficiency of the cycle and evaluate different scenarios to optimize the total cost of the cycle. The optimization of the model involved three different configurations by testing the impact of a variable number of trucks, painters, and steel fixers on the direct cost for the projects and resource utilization percentage. The findings of this paper demonstrated the comparison between three different scenarios for steel fixers, painters, and fixers that determined the optimum cost and resource utilization for completing the fabrication cycle. The paper concludes by highlighting the contributions and future directions of this research.