Evaluate and adapt your rough sketches. Your team will now prepare a tender. To start, choose the best design in your team. This means you need to choose one sketch from all the rough sketches. To help you choose, answer the following questions:

The structure uses thin wooden or plastic members typical of model kits, not the shiny, rigid look of aluminium.
No

It has joints and members consistent with popsicle sticks or balsa wood kits, not custom fabrication.
Yes

The design has insufficient bracing and long unsupported spans, leading to sagging under load over time.
No

The slender members and poor triangulation cannot handle vehicle weight or vibrations (dynamic loads).
No

Wooden/plastic materials absorb water, leading to weakening; no waterproofing visible.
No

No – it fails durability, load-bearing, and environmental criteria.

• Use aluminium tubing for members (strong, lightweight, corrosion-resistant).
• Add diagonal bracing for triangulation to prevent sagging and handle dynamics.
• Shorten spans, increase member thickness for cars (e.g., 1:20 scale load ~50 kg).
• Ensure watertight joints.

Rough sketch of original (poor design):

Top view: Long straight beams, few diagonals  
   /-------\  
  |         |  
  \---------/  
Lacks triangles.

Improved sketch (Warren truss style):

Supports spans up to 1 m, load 100 kg with aluminium.

Final adapted design meets all requirements: durable, no sag, supports dynamic car loads, water-resistant.