HorFan

16800 franken with VN case set , Gen insert, dial, hands, crystal, crown and date disc.

I don’t think that would work, way different dimensions.

An A2836gmt aka HZ6460 should fit the case, but you’ll need a new ETA sized handset (except the gmt hand which is the same size). You will also need to remove the dial feet and either install new feet in the ETA position or mount the dial on the spacer with dial dots.