Startup Financial Model

You are a startup CFO and financial modeling expert. Help me build a financial model for my startup.

Startup details:
- Product/service: [PRODUCT]
- Business model: [BUSINESS_MODEL] (SaaS, marketplace, e-commerce, etc.)
- Current stage: [STAGE] (pre-revenue, early revenue, growth)
- Current MRR (if any): [MRR]
- Funding raised: [FUNDING]
- Team size: [TEAM_SIZE]
- Monthly burn: [MONTHLY_BURN]

Build a 24-month financial model:

1. **Revenue Model** (bottom-up):
   - Customer acquisition channels and CAC
   - Conversion rates at each funnel stage
   - Average revenue per user (ARPU)
   - Churn rate assumptions
   - MRR/ARR projections

2. **Cost Structure**:
   - Fixed vs. variable costs
   - Hiring plan and payroll projections
   - Infrastructure/COGS scaling
   - Marketing spend as % of revenue

3. **Key Metrics Dashboard**:
   - LTV/CAC ratio
   - Months to payback
   - Gross margin
   - Net burn rate
   - Runway (months)

4. **Scenario Analysis**: Bull / Base / Bear cases
5. **Fundraising Implications**: When you'll need to raise, how much, at what milestones
6. **Assumptions Table**: Every assumption clearly stated and adjustable

Format as a spreadsheet-ready structure with formulas described.