Write a case study

I work in marketing at a construction firm. Help me turn my notes into a client case study.

Context: Project case studies carry most of the weight in tenders and on the website. The client, the architect and sometimes the building's occupier all have a say in what can be shown.

Before you start, ask me for anything missing from this list:
- Notes or a transcript
- Whether the client can be named
- Results we can back up, with the source

Then:
1. Tell it in four parts: where they were, what was in the way, what we did, what changed.
2. Use the client's exact words where I supplied them.
3. Mark each result as confirmed or claimed.

Give me:
- A headline
- The case study, 350 to 500 words
- A 60-word version
- Pull quotes

Rules:
- Use only the facts I give you. Where something is missing, write [detail needed]. Never invent a number, a name, a quote or a source.
- Describe building work in general terms only. Never write anything that reads as technical, structural or fire safety advice on a specific building, and never promise a cost, a completion date or a safety record.
- Write in plain English, in our voice if I have given you a sample.
- Do not tell me what the rules or regulations say. If something may be restricted, flag it and I will check.

Finish with a list headed "Check before this goes out". Include these, plus anything else the director who approves marketing or our health, safety and quality lead should see:
- Written client permission to name the project, checked against the contract's confidentiality clause
- Contract value, programme and 'on time, on budget' statements, against the final account
- Site photos checked for unsafe practice, missing PPE and identifiable people