Problem statement. Modern design of robotic technological complexes (RTCs) for machine part manufacturing requires reproducible engineering methods for evaluating layout efficiency at the design stage. Existing approaches do not sufficiently formalize the relationships among the reachable, accessible, actually used, and unused parts of the industrial robot (IR) workspace, which complicates quantitative comparisons of alternative layouts and rational robot selection. Purpose. The purpose of this study is to develop a two-parameter model to evaluate the implementation efficiency of RTC layouts by combining spatial assessment of the industrial robot working zone with kinematic assessment of the workpiece transfer cycle time. Methodology. The study applies systems analysis, structural decomposition, geometric modeling, kinematic analysis, and layout parameter optimization. The workspace is represented through accessible and used areas, while motion trajectories between technological positions are evaluated using trajectory lengths and average end-effector speed. Findings. Practical validation for an RTC that includes metal-cutting machine tools, a conveyor, and a KUKA KR 60-3 industrial robot confirmed that a rational spatial arrangement of equipment reduces trajectory lengths and work-cycle duration while increasing the working-zone utilization coefficient and reducing unused workspace. Originality. The scientific novelty lies in formalizing the structural-parametric synthesis of RTCs as a coordinated selection of spatial layout parameters, trajectory characteristics, and workspace constraints. Technological positions are considered as an interconnected system of coordinate-geometric parameters that affect reachability, maneuverability, travel distance, cycle time, and workspace utilization. Practical value. The proposed model can be integrated into CAD, simulation, and virtual commissioning environments to verify layouts, assess reachability, identify unused workspace, compare alternative trajectories, and select a rational industrial robot before physical implementation of the complex. Future research directions. Further development should account for energy consumption, dynamic loads, positioning accuracy, the probability of singular configurations, multi-criteria optimization algorithms, and RTC digital twins.