How do I create assembly file which contains two or more more netmodules?

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compiler

linker

modules

embedding

Hello,

Question
Is it possible to create assembly which contains two or more .netmodules?
If yes, how to achieve that?
Which tool should I use?

I do not want to reference them, I want to put modules inside assembly.

I already found that there are several tools which are able to link/merge/embed/reference modules into one assembly.
But, none of tools are doing exactly what I want.

Here is what tried already:

I have two source files: L1.cs, E1.cs.

class L1
    {
        public string GetMsg()
        {
            return "Hello, L1 here.";
        }
    }

    public static class E1
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Hi, I'm Main!");
            L1 c = new L1();
            Console.WriteLine(c.GetMsg());
        }
    }

With C# compiler, from Visual studio command prompt, I am able to create modules:

> csc -t:module -out:L1.netmodule L1.cs
> csc -t:module -out:E1.netmodule -addModule:L1.netmodule E1.cs

Option 1: Visual C++ Linker

> link -out:MyDll.dll /ltcg /dll *.netmodule 

But, according to manifest there is only one module in assembly MyDll. Source code is there, but there is only one module (maybe I am reading it in wrong way :?)

// Metadata version: v4.0.30319
.assembly extern mscorlib
{
  .publickeytoken = (B7 7A 5C 56 19 34 E0 89 )                         // .z\V.4..
  .ver 4:0:0:0
}
.assembly MyDll
{
  .custom instance void [mscorlib]System.Runtime.CompilerServices.RuntimeCompatibilityAttribute::.ctor() = ( 01 00 01 00 54 02 16 57 72 61 70 4E 6F 6E 45 78   // ....T..WrapNonEx
                                                                                                             63 65 70 74 69 6F 6E 54 68 72 6F 77 73 01 )       // ceptionThrows.
  .hash algorithm 0x00008004
  .ver 0:0:0:0
}
.module MyDll.dll
// MVID: {A4FA5CEA-08F8-4A93-BDD3-A2EBD1715B58}
.imagebase 0x10000000
.file alignment 0x00000200
.stackreserve 0x00100000
.subsystem 0x0002       // WINDOWS_GUI
.corflags 0x00000001    //  ILONLY
// Image base: 0x008A0000

Option 2: Assembly Linker
I tried:

al -t:library -out:MyDllAl.dll E1.netmodule L1.netmodule

Results are not what I wanted.
There are more modules, but they are not part of MyDllAl.dll assembly. They are referenced :(.

Option 3: IlMerge, IlRepack
I already used IlMerge - results are disappointing - only one module in assembly.
I haven't tried IlRepack, but according to documentation it's 'clone' of IlMerge (there are few differences, but results are same).