To prepare the model for export you need to decide how to divide up the model.
Parts should be named something like this.
Note I have guessed the number and type of guns etc
You will need to correct my guesses.
//Hull Meshes
L0_Hull1
L0_Hull2
L0_Hull3
//Superstructure Meshes
L0_SSF
L0_SST
L0_Stack1
L0_Mast1
L0_Mast2
L0_Wires
L0_Crane1
L0_Boat1
L0_Boat2
L0_Boat3
L0_Boat4
//more boats?
//Guns Section
//15in
L0_Head1
L0_Gun1
//4inHA
L0_Head2
L0_Gun2
L0_Head3
L0_Gun3
L0_Head4
L0_Gun4
L0_Head5
L0_Gun5
L0_Head6
L0_Gun6
L0_Head7
L0_Gun7
//40mm PomPom
L0_Head8
L0_Gun8
L0_Head9
L0_Gun9
//20mm Oerlikon
L0_Head10
L0_Gun10
L0_Head11
L0_Gun11
L0_Head12
L0_Gun12
L0_Head13
L0_Gun13
//Directors (any rotating parts)
L0_Head14
L0_Gun14
Move and rotate the entire model do that the bow points in the +ve x-axis direction.
z-axis points up obviously.
Ensure that 1 model unit = 1 metre
Select the entire model
Use - Utilities/Reset XForm/Reset Selected
This cleans up the model structure before export.
Check the pivot points of each object.
For all static parts make pivot point at x,y,z 0,0,0 and with the pivot aligned to the world axis.
For moving parts, turrets and directors
Move the pivot point to the axis of rotation for turrets and gun barrels etc.
The object will rotate about the z-axis
Turrets should have pivot point z-axis pointing up and x-axis pointing in direction of fire.
For guns rotate the pivot point so that z-axis is horizontal and y-axis points down.
x-axis should point in the direction of fire.
All should now be ready for export.
Post your corrected list for the model structure so that I can understand the parts of the model you are creating.