[Galaxy S II Android Development] the.gangster:
This is an open_gapps_log.txt I finally got from [MENTION=7183558]fireburner-de[/MENTION]. (thx)

There you can see the calculation in detail, of how much space is needed for pico-gapps by default, how much it needs as reserved free space, as well as how much it would need, if you even left away the few still optionally installed components (calsync,googletts,packageinstallergoogle).

# Begin Open GApps Install Log

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ROM Android Version | 6.0.1

ROM ID | cm_i9100-userdebug 6.0.1 MMB29U 72b72519e9 test-keys

ROM Version | 13.0-20160206-NIGHTLY-i9100

Device Recovery | TWRP 2.8.7.0

Using Bundled XZdec | false

Device Name | GT-I9100

Device Model | GT-I9100

Device Type | phone

Device CPU | armeabi-v7a,armeabi

getprop Density | 240

default.prop Density | 240

build.prop Density | 240

Display Density Used | 240dpi

Install Type | Dirty[Data NOT Wiped]

Google Camera Installed¹ | false

FaceUnlock Compatible | true

Google Camera Compatible | true

New Camera API Compatible | false

Current GApps Version | No GApps Installed

Google Camera version | Legacy

Installing GApps Version | 20160208

Installing GApps Type | pico

Config Type |

Using gapps-config | Not Used

Remove Stock/AOSP Browser | false[NO_Chrome]

Remove Stock/AOSP Camera | false[NO_CameraGoogle]

Remove Stock/AOSP Email | false[NO_Gmail]

Remove Stock/AOSP Gallery | false[NO_Photos]

Remove Stock/AOSP Launcher | false[NO_GoogleNow]

Remove Stock/AOSP MMS App | false[NO_Hangouts]

Remove Stock/AOSP Pico TTS | false[default]

Ignore Google Contacts | false

Ignore Google Keyboard | false

Ignore Google Package Installer | false

Ignore Google NFC Tag | true[NoRemove]

Ignore Google WebView | false

SwypeLibs | 922 (KB)

Total System Size (KB) | 1032088

Used System Space (KB) | 453664

Current Free Space (KB) | 578424

Post Install Free Space (KB) | 461498 << See Calculations Below

- Installing | swypelibs

- Installing | calsync

- Installing | googletts

- Installing | packageinstallergoogle

-----------------------------------------------------------------------------

¹ Previously installed with Open GApps

# End Open GApps Install Log

# Begin GApps Size Calculations

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TYPE | DESCRIPTION | SIZE | TOTAL

| Current Free Space | 578424 | 578424

Remove | Existing GApps | + 0 | 578424

Remove | Obsolete Files | + 24 | 578448

Remove | packageinstallerstock | + 1880 | 580328

Install | Core² | - 81514 | 498814

Install | calsync³ | - 1244 | 497570

Install | googletts³ | - 24800 | 472770

Install | packageinstallergoogle³ | - 2056 | 470714

| Buffer Space² | - 9216 | 461498

-----------------------------------------------------------------------------

Post Install Free Space | 461498

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² Required (ALWAYS Installed)

³ Optional (may be removed)

# End GApps Size Calculations

# Begin User's gapps-config

# End User's gapps-config

So not so many additional removals would be needed to fit into stock system size. But as these values are subject to change with each version of GApps (as also the space allocated by the ROM itself) it might not be worth the effort.