Outline a LinkedIn carousel

I work in marketing at a construction firm. Help me outline a LinkedIn carousel that explains one thing.

Context: Step-by-step topics suit this format: the stages of an extension, what happens before work starts on site, how a fit-out is sequenced around a trading business.

Before you start, ask me for anything missing from this list:
- The topic
- Who it is for
- The source material

Then:
1. Plan eight to ten slides with one idea each.
2. Write a first slide that states the benefit.
3. Keep each slide under 30 words.
4. Close with one next step.

Give me:
- Slide-by-slide text
- The caption to post with it

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:
- Each slide's technical statement, checked alone and out of context
- Timescales and stage durations shown as typical
- Images on each slide cleared for use and safe practice