Rocket nozzles is one of the most complex parts of a rocket. Especially when they need to warm the cryogenic propellant and have gimbal mechanisms attached on them. A pressure molded graphite nozzle is a good alternative but the design needs to be improved.
I propose the piping to be manufactured externally as a standalone design. Cavities can be made of plastic. Then, the graphite powder with some additional chemicals would be poured over these structures and pressure molded above them. Once the solid graphite block is ready, it would be heated to melt the plastic sections away. The metal piping would remain intact. This design allows propellant preheating on a solid block of graphite. Graphite is very strong, light weight and good conductor of heat which makes it a good nozzle material. The graphite block would cover the entire bottom of the rocket. This allows the thrust generated on nozzles to distribute evenly along the rocket bottom.
Some of the nozzles placed on the outer edge of the graphite block would have controlled inlet doors. These doors would be controlled remotely to allow some of the exhaust gas to escape from the side nozzles. These controlled exhaust vents would be used to maneuver the rocket, instead of the gimbal mechanisms.
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