Use platform height for the actual deck position
Tell the quote team how high the platform must sit above the floor. Keep this measurement distinct from overall tower height and guardrail height.
Describe the task directly
State the elevation of the work and how it must be reached. Do not add a fixed reach allowance to every setup; reach depends on the task and approved working arrangement.
Keep the quote unambiguous
Send platform height, task height, overhead clearance and site photos or measurements where available. Ask for the final configuration dimensions in the returned quotation.