Workplace Shell Architecture

Any plan on starting with Workplace Shell will need some understanding of the architecture.

From what I saw on EDM/2 WPS articles every one points that WPS is a set of classes constructed over SOM.

The classes of Warp 4 with their hierarchy are:

 SOMObject

• SOMClass
• SOMClassMgr
  • WPClassManager *
• WPObject
  • WPAbstract
    • WPClock
    • WPCountry
    • WPDisk
    • WPKeyboard
    • WPLaunchPad
      • SmartCenter *
    • WPMouse
    • WPPalette
      • WPColorPalette
      • WPFontPalette *
      • WPSchemePalette *
    • WPPower
    • WPPrinter
      • WPRPrinter
    • WPProgram
    • WPShadow
      • WPNetLink
    • WPShredder
    • WPSound
    • WPSpecialNeeds
    • WPSpool
    • WPSystem
    • WPWinConfig
  • WPFileSystem
    • WPDataFile
      • WPHtml
      • WPIcon
      • WPImageFile *
        • WPBitmap
      • WPMet
      • WPPif
      • WPPointer
      • WPProgramFile
        • WPCommandFile
      • WPUrl *
    • WPFolder
      • WPDesktop
      • WPDrives
      • WPHost *
      • WPHwManager *
      • WPMinWinViewer
      • WPNetgrp
      • WPNetwork
      • WPRootFolder
      • WPServer
      • WPSharedDir
      • WPStartup
      • WPTemplates
      • WPUrlFolder
  • WPTransient
    • WPJob
    • WPDevice *
      • WPDevAudio *
      • WPDevBus *
      • WPDevCDRom *
      • WPDevCPU *
      • WPDevDiskette *
      • WPDevDisplay *
      • WPDevHarddrive *
      • WPDevKeyboard *
      • WPDevMemory *
      • WPDevMouse *
      • WPDevParallel *
      • WPDevPeriph *
      • WPDevSerial *
      • WPDevTape *
      • WPDevTimer *
    • WPPdr
    • WPPort
    • WPQdr

There is also an API that has WPS related functions like WinCreateObject and a lot more, but those are part of the Presentation Manager API (I think).

My next steps is trying to understand more about WPS to solve this questions:

1) If we have an open source replacement for all this WPS Classes can we say that we have a 100% WorkplaceShell open source clone?

2) What will be the effort of replacing all this classes based on what it had been done in the XWorkplace project.?