Compact High-Efficiency Alternator Design

I am looking for someone to design a lightweight and compact 3 phase alternator.

To provide as much info as possible, I am looking for a high-efficiency permanent magnet generator (PMG) optimized for a lightweight, high-power application. The generator must be designed for continuous operation at variable loads while ensuring maximum efficiency and minimal weight.
Technical Requirements:

✔ Power Output: 7.0 kW – 7.5KW (Continuous)
✔ Operating Speed: 6000 RPM to produce the 7.0Kw – 7.5Kw
✔ Torque Requirement (Max): ≤ 14 Nm at 6000 RPM
✔ Output Type: Three-phase AC
✔ AC Output Voltage: Flexible, based on best efficiency design for this power level
✔ Peak Efficiency: ≥90% preferred
✔ Construction Type: Permanent Magnet Generator (PMG)
✔ Weight Target: Ideally ≤ 4Kg
✔ Cooling: Air-cooled preferred (natural or forced-air)
✔ Pole Configuration: Flexible, based on best efficiency for the design
✔ Environmental Considerations: Must operate reliably in outdoor conditions
Application Considerations:

The generator must provide stable power output across varying RPMs while maintaining efficiency (see table)

The torque requirement must remain below 14 Nm at 6000 RPM to match system constraints.

If available, please provide efficiency curves, torque-speed graphs, and thermal performance data.

The three-phase AC output will be rectified, so a well-regulated waveform is preferred.

A lightweight and compact design is a high priority.

See the attached table for a "general guide" but a close one to.