Design a Small utility vehicle

I rent small recreational vehicles to tourists and want to start building a custom vehicle that is modular (removable doors and windows), rugged and relatively cheap to produce. Currently the only vehicles I am able to rent are the Polaris Ranger 570-6 and the Can-Am Defender Max. These vehicles are very expensive(14,000-20,000USD) and come with too many features (4x4, oversized suspension, etc). The design currently on the market that most resembles what I need is the Multix MX, which I have included the photos for in this project. I need an engineer to design a chassis and body panels similar to the Multix MX, and have it be compatible with readily available parts(suspensions, instrument clusters, engines, transmissions, etc. It does not need to have 4x4 traction, nor do the body panels need to be very stylized, the simpler and easier to manufacture, the better. Features required: Chassis designed for light loads ( passengers and luggagge, small machinery) Removable doors with windows Removable or foldable windshield. CVT or automatic transmission. Rear engine. Seating for 6. Rear cargo bed. Left hand driver position.