Question [Q] Custom ROM without call possibilities

Hi,

It might be a stupid question, but I was wondering if it is possible to build a ROM with a very minimum features. No phone possibilities, no bluetooth, no gps, no sync with anything.... Turn it to a Ipod Touch like in someways...
I could use any ROM without using all these feature, but by removing all the unnecessary, could it be lighter and faster ?

I am asking that, because I have a aging I9000 and I would like to turn it up to a remote control only. I am currently using it for Spotify, my AV Receiver, XBMC, my NAS. So, actually, I just need WIFI, and maybe access to Google Play to install the apps needed, but it could be done by installing the APK directly.

That's it !
Thanks