Some more rules for the project.
1. For a £2000 budget, someone else should be able to reproduce the vehicle.
2. No complicated machined parts or expensive parts scavenged from other machines bought cheap off eBay. The build has to be simple and repeatable so only parts that can be easily and cheaply bought now and in the future. Pillow bearings, New ATV wheels, New pit bike parts, box section steel, etc.
3. Laser cut or machined parts would have to be costed into the budget at reasonable cost, this knocks out expensive machined components like in rule 2. But laser profiles and simple lathe parts can work if they help simplify the build.
4. Designed to last 50 years with replacement of wear parts/electronics.