The following images are some of the "concept art" used by North American Aviation to secure the contract from NASA to build the Apollo spacecraft.
Check out Scott Manley's video here.
3069-13B: Apollo Configuration
3069-31H: Command Module Configuration
3069-36E: Service Module - Equipment Installation
3069-37D: Layout Location of Display Panels Command Module
3069-39B: Apollo - Command Module Equipment Arrangement
3069-44: Apollo Command Module Landing Impact Bags
3069-45C: Apollo Air Locks Installation
3069-46A: Astronaut Typical for USAF 10 Percentile
3069-48C: Upper Compartment Equipment Install (Parachute Recovery System)
3069-49A: Apollo - Command Module Structure
3069-50A: Astronaut Eye Location
3069-52D: Display & Control Panels Command Module
3069-53A: Apollo Command Module Seat Outbd
3069-54D: Space Lab & Adapter
3069-55C: Apollo Launch Escape Tower Systems Installation
3069-56B: Apollo - Service Module Structure Assy
3069-57: Crew Seat & Observation Geometry
3069-60: Structure - Command Module Hatch and Seat Ejection Break Out Panel Provisions
3069-61: Apollo Command Module Mock-up - Work Station
3069-63: Apollo Command Module Inter-Module & G.S.E Connections
3069-65: Apollo Command Module Inter-Module & G.S.E Connections
3069-66A: Apollo - Command Module Periscope System
3069-68: Apollo Command Module Seat - Center
3069-69: 90 Percentile Astronaut
3069-70B: Apollo-Lunar Landing Module Vertical Landing
3069-71A: Apollo Command Module Seat Support System
3069-72B: Dish Antenna Installation (Serv. Mod.)
3069-73: Command Module Ablative Structure
3069-74: Bed Seat Support Structure - Command Module Hatch Area
3069-77B: Command Module - Configuration C For Parawing
3069-78: Upper Compartment Equipment Install (Parawing Recovery System)
3069-80: Apollo Parawing - 3 View
3069-90: Equipment Instal. Side Panels
3069-91: Outb'd Seat Support Frame Assy
3069-92: Center Seat Support Frame Assy
3069-93B: Command & Service Module Systems Block Diagram
3069-94: Apollo Hard Mock-up Electronic Module
3069-95: Apollo Outboard Seat Supports Head End
3069-96: Apollo Command Module Seat Footward Suspension (Mockup)
3069-97: Apollo Hard Mock-up Work Station Display Panels
3069-98: Apollo Command Module Center Seat Frame Head End Support (Mockup)
3069-101: Apollo Command Module Electrical Harness And Plubming Installations
3069-103: Apollo Environmental Control System Air Research MFG
3069-104: Astro - Sextant Mockup Apollo Command Module
3069-105: Apollo Command Module Seat Suspension Springing
3069-110: Apollo Command Module Seat Support System - Beam & Tension Strut Mounting Version
3069-111: Command Module Config #2 (Revised Seat Suspension)