Can I swap the internal storage with an external SD?

[a7mag3ddon]

Swapping internal and external SD help

Hi, are there any geniuses on the forum who can help me swap the internal storage with an external SD card?

So far i have tried internal2external from play store which should work (but i think its not compatible with 4.4.2)

I have also tried to edit my vold.fstab which didnt work either see below...
Originally : dev_mount SdCard /mnt/extSdcard auto /devices/msm_sdcc.2/mmc_host
changed to : dev_mount extSdCard /mnt/Sdcard auto /devices/msm_sdcc.2/mmc_host

The only thing left to do is if i did things correctly above is to edit the build.prop but that scares me a little bit.

Any ideas?