Final answer:
A specific percentage representing the cost of assembling steel H-frame structures compared to rigid-lattice work steel towers cannot be provided without further context, as costs can vary widely. For accurate estimates, current industry standards or professional consultation are recommended.
Step-by-step explanation:
The cost of structure assembly for steel H-frame structures compared to standard rigid-lattice work steel towers does not appear to have a universal answer because it can vary depending on specific project requirements, geographic location, labor rates, material costs, and other economic factors. Typically, H-frame structures may be seen as less expensive due to fewer materials used and easier transportation and installation, but assigning a specific percentage without more context is not accurate. For the most precise answer, one should refer to current industry standards, data from recent projects, or reach out to professionals in the field of structural engineering for an updated estimate.