BiDirectional DC-DC Converter 4 kilowatts, 48VDC - 300 VDC - Repost - open to bidding

I seek the design of a 4 KW BiDirectional DC-DC converter. Voltage on one side should be 48VDC, and voltage on the other side should be 300 VDC. AND VICE VERSA .THAT MENS reversable also. The primary consideration is weight (kilogram/kiloWatt), secondary consideration is efficiency, third consideration is space. Component cost is not really a consideration. Deliverable would be a schematic, component list, and PCB layout. If microprocessors are used in the design, any software source code should be included. (Preferred microprocessor is STM32, but not a major consideration). A similar design can be found at [login to view URL] Other potential designs might be CUK or other topologies. Commercially available products do not appear to meet weight limits.