Hi Elpheli,
Nice start on your Type IIB model. We've just designed white pre-war numbers in 144th scale for this kit. Assuming we can get them printed at a reasonable price, then AMP will be releasing these decals for you. Oh, and the decal sheet would include Type II waterline draft markings in 144th scale as well.
Looking forward to your build.
Cheers,
Dougie