Add-In conversion to VSIX in unmanaged C++

Hi,

I have an existing Add-in, (originally written for MSVC++-7.0), written in unmanaged C++ using ATL/COM.  I'm attempting to convert it to a VSIX package, but existing documentation is sadly lacking in this regard.  Due to the, (rather large), existing code-base in C++, it is not feasible to convert to C#, VB or any other .NET approach.  I need to remain firmly in ATL/COM land.

I have obtained the DTE, via the following, (error checking removed for clarity):

    if (!_pDTE) {
        CComPtr<IUnknown> punk;
       pSP->QueryService(SID_SDTE, IID__DTE, (void**)&punk);
        _pDTE = punk;
    }

Where "_pDTE" is: CComPtr<VxDTE::_DTE> _pDTE; and
           "pSP" is IServiceProvider *pSP.

This works and I can do the following for example:
     _pDTE->ExecuteCommand(L"Build.Compile", L"");

Which triggers a compile of a single file as expected.

Here's the question:

How can I monitor build events?  (Specifically, OnBuildBegin, OnBuildDone, OnBuildProjConfigBegin and OnBuildProjConfigDone?

Previously this was done by creating a class "BuildEventsSink" which inherits from:

IDispEventImpl<1, BuildEventsSink, &__uuidof(EnvDTE::_dispBuildEvents), &EnvDTE::LIBID_EnvDTE, 8, 0>

Then doing:
    BEGIN_SINK_MAP(BuildEventsSink)
    SINK_ENTRY_EX(1, __uuidof(EnvDTE::_dispBuildEvents), 3, OnBuildBegin)
    SINK_ENTRY_EX(1, __uuidof(EnvDTE::_dispBuildEvents), 4, OnBuildDone)
    SINK_ENTRY_EX(1, __uuidof(EnvDTE::_dispBuildEvents), 5, OnBuildProjConfigBegin)
    SINK_ENTRY_EX(1, __uuidof(EnvDTE::_dispBuildEvents), 6, OnBuildProjConfigDone)
    END_SINK_MAP()

Related followup question:
How can I have my VSIX package load automatically using COM/ATL once a solution is open?

Thanks in advance!

--R