One thing for sure... the length in .cfg files are all wrong and is very visible. Just compare the Cimmaron (Length=139.6) with the Liberty (Length=147), so in the cfg files the cargo ship is longer than a huge tanker. These are dummy values, not the real stuff.
I created a dummy mission where I listed all cargo ships from the ME roster in docked state for the purpose to be measured. Reaper, maybe you can do that with you RAOFB or any other advanced measurement tool, I still use the stock UI.
Ships listed in the mission and they stock .cfg values are:
_BR C1-B medium merchant
ClassName=VV
3DModelFileName=data/Sea/NVV/NVV
UnitType=102
MaxSpeed=17
Length=139.6
Width=18.5
Mast=27.9
Draft=7.3
_BR Liberty
ClassName=LL
3DModelFileName=data/Sea/NLL/NLL
UnitType=102
MaxSpeed=13
Length=147
Width=18.1
Mast=27.1
Draft=5.8
_BR Large Merchant (ProxY)
Is the Large Steamer.. can't find the right folder...
_BR Large Merchant / War supplies (ProxY)
Can't find the right folder...
_BR C2-S-B1 large merchant
ClassName=KLCSC2SB1
3DModelFileName=data/Sea/NKLCS_C2SB1/NKLCS_C2SB1
UnitType=102
MaxSpeed=12
Length=139.6
Width=18.5
Mast=28.2
Draft=7.3
_BR Victory Ship
ClassName=VV
3DModelFileName=data/Sea/NVV/NVV
UnitType=102
MaxSpeed=17
Length=139.6
Width=18.5
Mast=27.9
Draft=7.3
_BR Medium Old Split Merchant (aka Hog Island)
ClassName=KMSSHogIsland
3DModelFileName=data/Sea/NKMSS_HogIsland/Hog_Island
UnitType=102
MaxSpeed=11
Length=120
Width=15
Mast=28.4
Draft=4.7
I'm on the work laptop now so I can't test the mission, but it should be all right.
Link to the mission:
http://www.zumodrive.com/share/6UmxYzkwMT