[Help] Modifying JB GApps Package

Device: gt-i9100 (cm 10.1.3 stable)
Package: gapps-jb-20130812-signed.zip (cm 10.1 gapps)

I was planning on slimming down the package to something like pico gapps (system base, calendar sync, play store, play services) for higher Android OSes, but I'm not sure where to start.

I thought it would be as easy as removing related apks, repacking, then flashing from recovery, but I think it's more than that considering there are other files inside the zip. Aside from not knowing what files to leave and remove and there are some scripts which I think requires editing for the package to work.

Currently I'm comparing the contents with Open GApps 5.1 pico package hoping to get some clues. Any detailed information is appreciated.

File structure:

Code:

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/gapps-jb-20130812-signed
  /META-INF
    /com
      /google
        /android
          update-binary
          updater-script
    CERT.RSA
    CERT.SF
    MANIFEST.MF
  /optional
    /face
      /addon.d
        71-gapps-faceunlock.sh
      /app
        FaceLock.apk
      /lib
        libfacelock_jni.so
      /vendor
        /pittpatt
          /models
            /detection
              /multi_pose_face_landmark_detectors.7
                /left_eye-y0-yi45-p0-pi45-r0-ri20.lg_32
                  full_model.bin
                /nose_base-y0-yi45-p0-pi45-r0-ri20.lg_32
                  full_model.bin
                /right_eye-y0-yi45-p0-pi45-r0-ri20.lg_32-2
                  full_model.bin
              /yaw_roll_face_detectors.6
                /head-y0-yi45-p0-pi45-r0-ri30.4a-v24
                  full_model.bin
                /head-y0-yi45-p0-pi45-rn30-ri30.5-v24
                  full_model.bin
                /head-y0-yi45-p0-pi45-rp30-ri30.5-v24
                  full_model.bin
            /recognition
              /face.face.y0-y0-22-b-N
                full_model.bin
  /system
    /addon.d
      70-gapps.sh
    /app
      ChromeBookmarksSyncAdapter.apk
      ConfigUpdater.apk
      GenieWidget.apk
      Gmail.apk
      GmsCore.apk
      GoogleBackupTransport.apk
      GoogleCalendarSyncAdapter.apk
      GoogleContactsSyncAdapter.apk
      GoogleEars.apk
      GoogleFeedback.apk
      GoogleLoginService.apk
      GooglePartnerSetup.apk
      GooglePlus.apk
      GoogleServicesFramework.apk
      GoogleTTS.apk
      LatinImeDictionaryPack.apk
      MediaUploader.apk
      NetworkLocation.apk
      OneTimeInitializer.apk
      Phonesky.apk
      QuickSearchBox.apk
      SetupWizard.apk
      TalkBack.apk
      VoiceSearchStub.apk
    /etc
      /permissions
        com.google.android.maps.xml
        com.google.android.media.effects.xml
        com.google.widevine.software.drm.xml
        features.xml
      /preferrec-apps
        google.xml
      g.props
    /framework
      com.google.android.maps.jar
      com.google.android.media.effects.jar
      com.google.widevine.software.drm.jar
    /lib
      libAppDataSearch.so
      libfilterpack_facedetect.so
      libfrsdk.so
      libgames_rtmp_jni.so
      libgcomm_jni.so
      libgoogle_recognizer_jni.so
      libgoogle_recognizer_jni_l.so
      libgtalk_jni.so
      libgtalk_stabilize.so
      libjni_latinime.so
      libpatts_engine_jni_api.so
      libplus_jni_v8.so
      librs.antblur.so
      librs.antblur_constant.so
      librs.antblur_drama.so
      librs.drama.so
      librs.film_base.so
      librs.fixedframe.so
      librs.grey.so
      librs.image_wrapper.so
      librs.retrolux.so
      librsjni.so
      libRSSupport.so
      libspeexwrapper.so
      libvcdecoder_jni.so
      libvorbisencoder.so
      libwebp_android.so
    /tts
      /lang_pico
        de-DE_gl0_sg.bin
        de-DE_ta.bin
        es-ES_ta.bin
        es-ES_zl0_sg.bin
        fr-FR_nk0_sg.bin
        fr-FR_ta.bin
        it-IT_cm0_sg.bin
        it-IT_ta.bin
    /usr
      /srec
        /en-US
          acoustic_model
          c_fst
          clg
          compile_grammar.config
          contacts.abnf
          dict
          dictation.config
          embed_phone_nn_model
          embed_phone_nn_state_sym
          endpointer_dictation.config
          endpointer_voicesearch.config
          ep_acoustic_model
          g2p_fst
          google_hotword.config
          google_hotword_clg
          google_hotword_logistic
          grammar.config
          hmmsyms
          hotword_symbols
          lintrans_model
          metadata
          norm_fst
          normalizer
          offensive_word_normalizer
          phonelist
          rescoring_lm
          symbols
  install-optional.sh

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I am willing to mess around just to learn :)