Quim, there's this nifty organization out there called Debian. You should look it up someday.

Seriously, talk to them, they're doing all this stuff much better than you are - BECAUSE they've been through the whole iterative development, compatibility, testing, FREE (libre) releases for what, 15 years now? They know what doesn't work.

Please don't reinvent the wheel, or even pretend you're the first down this road.