[Ramius]

To make any of the non playable subs playable you need to add things like the masts etc into the relevant sub file. You also need to tell it what HUD to use.

This is what you would need for the Akula....

 

Designation=SSN
ShipType=SUBMARINE
PlayerHUD=hud/russian

Length=110.3
Beam=13.6
HullHeight=0.08
Displacement=12770
Crew=73
Range=10000
HullNumbers=FALSE

[Movement]
SurfaceSpeed=10
SubmergedSpeed=35
TelegraphSpeeds=-5,0,5,10,15,20,35
AccelerationRate=0.3
DecelerationRate=0.08
RudderTurnRate=1
TurnRate=2.1
PivotPointTurning=0.256
DiveRate=5
SurfaceRate=5
BallastRate=0.25
Waterline=0.04
SubmergedAt=0.15
CavitationParameters=20,-100
PropRotationSpeed=150
TestDepth=1570
EscapeDepth=600

[Acoustics & Sensors]
SelfNoise=125
ActiveSonarReflection=30
ActiveSonarModel=wp_mgk540
PassiveSonarModel=wp_mgk540
TowedArrayModel=wp_pelamida
AnechoicCoating=FALSE
RADAR=wp_snoop_tray
RADARSignature=SMALL

[Weapon Systems]
TorpedoTypes=wp_uset-80,russian_moss_2,wp_ss-n-16,wp_53-65M,wp_kalibr_3m54,wp_kalibr_3m14
TorpedoNumbers=20,5,6,0,6,8
TorpedoTubes=8
NumberOfWires=8
TubeConfig=1,1,1,1,1,1,1,1
TorpedoTubeSize=21
TubeReloadTime=30

NoisemakerName=wp_noisemaker
NumberOfNoisemakers=20
NoisemakerReloadTime=20

[Subsystems]
LabelPosition=364.3,28
BOWSONAR=FRONT
LabelPosition=59.9,193.2
TOWED=REAR
LabelPosition=409.7,193.3
PERISCOPE=SAIL
LabelPosition=409.7,151.4
ESM_MAST=SAIL
LabelPosition=409.7,171.9
RADAR_MAST=SAIL
LabelPosition=364.3,49.4
TUBES=FORE,FRONT
LabelPosition=229.6,193.2
FIRECONTROL=FORE
LabelPosition=229.6,172.2
PUMPS=MID,AFT
LabelPosition=59.9,27.7
PROPULSION=AFT,REAR
LabelPosition=59.9,172.2
RUDDER=REAR
LabelPosition=59.9,48.7
PLANES=SAIL,REAR
LabelPosition=190.8,49
BALLAST=MID
LabelPosition=190.8,28
REACTOR=MID

[Flooding Display: x,width,ymin,ymax]
FLOODING1=160,45,-77,-39
FLOODING2=107,58,-77,-39
FLOODING3=47,61,-77,-39
FLOODING4=-23,74,-77,-39
FLOODING5=-90,59,-76,-39
DamageControlPartyY=-31

[Model]
ModelFile=ships/wp_ssn_akula1/wp_ssn_akula1

//Hull and Deck
MeshPosition=0,0,0
MeshRotation=0,0,0

MeshHullCollider=wp_ssn_akula1_coll_hull
MeshSuperstructureCollider=wp_ssn_akula1_coll_ss

Material=ships/wp_ssn_akula1/wp_ssn_akula1_mat
MaterialTextures=ships/wp_ssn_akula1/wp_ssn_akula1_tx,ships/wp_ssn_akula1/wp_ssn_akula1_spec,ships/wp_ssn_akula1/wp_ssn_akula1_nm
Mesh=wp_ssn_akula1
Mesh=wp_ssn_akula1_crest
MeshPosition=0,0,-0.6494
MeshRudder=wp_ssn_akula1_rudder
MeshPosition=0,0.0096,0.60
MeshBowPlanes=wp_ssn_akula1_bowplanes
MeshPosition=0,0,-0.6446
MeshSternPlanes=wp_ssn_akula1_sternplanes
MeshPosition=-0.0,0,-0.793
MeshProp=wp_ssn_akula1_prop

[Model]
ModelFile=ships/usn_ssn_permit/usn_ssn_permit
Material=ships/materials/usn_masts
MeshPosition=0,0.055,0.247
MastHeight=0.085
MeshMast=usn_ssn_permit_periscope

MeshPosition=-0.006,0.042,0.134
MastHeight=0.085
MeshMast=usn_ssn_permit_esm_mast

MeshPosition=0,0.042,0.075
MastHeight=0.085
MeshMast=usn_ssn_permit_radar_mast

[Weapon Systems]
//Torpedo Mounts

//Tube 1
MeshRotation=0,0,0
MeshPosition=0.019,0.053,0.7336
TorpedoSpawnPosition=0.016,0.04,0.755
TorpedoEffectPosition=0,0,0.0232

//Tube 2
MeshRotation=0,0,0
MeshPosition=-0.019,0.053,0.7336
TorpedoSpawnPosition=0,-0.0085,0.755
TorpedoEffectPosition=0,0,0.0232

//Tube 3
MeshRotation=0,0,0
MeshPosition=0.0189,0.0339,0.7501
TorpedoSpawnPosition=0.0155,0.0218,0.743
TorpedoEffectPosition=0,0,0.0232

//Tube 4
MeshRotation=0,0,0
MeshPosition=-0.0189,0.0339,0.7501
TorpedoSpawnPosition=-0.0155,0.0218,0.743
TorpedoEffectPosition=0,0,0.0232

//Tube 5
MeshRotation=0,0,0
MeshPosition=0.0411,0.0336,0.743
TorpedoSpawnPosition=0.044,0.0212,0.723
TorpedoEffectPosition=0,0,0.0232

//Tube 6
MeshRotation=0,0,0
MeshPosition=-0.0411,0.0336,0.743
TorpedoSpawnPosition=-0.044,0.0212,0.723
TorpedoEffectPosition=0,0,0.0232

//Tube 7
MeshRotation=0,0,0
MeshPosition=0.0411,0.0336,0.743
TorpedoSpawnPosition=0.044,0.0212,0.723
TorpedoEffectPosition=0,0,0.0232

//Tube 8
MeshRotation=0,0,0
MeshPosition=-0.0411,0.0336,0.743
TorpedoSpawnPosition=-0.044,0.0212,0.723
TorpedoEffectPosition=0,0,0.0232

//Noisemaker Mount
MeshRotation=0,0,0
MeshPosition=0,-0.056,-0.533
MeshNoisemakerMount=FALSE

MeshPosition=0,0,0
ModelFile=ships/wp_ssn_akula1/wp_ssn_akula1

//Wake
MeshPosition=0,0,0
BowWaveParticle=ships/particles/bowwave_sub
PropWashParticle=ships/particles/bowwave_small
CavitationParticle=ships/particles/wp_ssn_akula1_cavitation
FunnelSmokeParticle=ships/particles/wp_ssn_akula1_bubbles
EmergencyBlowParticle=ships/particles/wp_ssn_akula1_emergency_blow

ParticleBowWavePosition=0,0,0.765
ParticlePropWashPosition=0,-0.035,-0.747

ParticleHullFoamPosition=0,0,0.637
ParticleHullFoamParameters=10,0.25,0.25,0.055,0,0, 0.25

ParticleSternFoamPosition=0,0,-0.629
ParticleSternFoamParameters=25,0.25,0.15,0.025,0.0 1,0,0.25
KelvinWaves=2.6,2.6

EngineAudioClip=audio/units/submarine_engine_3
EngineAudioRollOff=LOGARITHMIC
EngineAudioDistance=1,20
EngineAudioPitchRange=0.4,1
PropAudioClip=audio/units/submarine_propeller
PropAudioRollOff=LOGARITHMIC
PropAudioDistance=1,20
PropAudioPitchRange=0.1,0.6
PingAudioClip=audio/environment/sonar_ping_lf
PingAudioRollOff=LOGARITHMIC
PingAudioDistance=1,50
PingAudioPitch=1

You will have to double check the weapons used under lines..
TorpedoTypes=wp_uset-80,russian_moss_2,wp_ss-n-16,wp_53-65M,wp_kalibr_3m54,wp_kalibr_3m14
TorpedoNumbers=20,5,6,0,6,8
As not all of them will be in the default game. Numbers match the number of weapons on board sub, so if 6 named then has to be 6 numbers etc (MAX of 6 types or you will have issues!)