In all honesty then it may be worth while building it from the ground up to make sure that we don't get something slipped in by accident. Bring in some updated libs as a bonus maybe. As current, shall we say, options are available there is no great rush.

In terms of standard apps; Photos, Contacts, Phone, Conversations and related settings widgets I would probably say are the key features that still need replacements if I remember correctly without looking at list. Maps isn't as much of an issue as we have alternatives (Marble, Modrana). MicroB is another one that needs replacing but without switching everything to updated libraries (qt5) to build a newer version, is it worth it. As a bonus, having updated html5 support would greatly reduce need of flashplayer anyway.

Pali, fmg and co have made great progress lately with regards to drivers. SGX, I found this https://bugs.launchpad.net/ubuntu/+bug/652347 quite interesting. Nemo has license details https://github.com/nemomobile/ti-oma...pm/license.txt and packages exist for ubuntu.

http://old-releases.ubuntu.com/ubunt...les-sgx-omap3/
https://launchpad.net/ubuntu/+source...00.01-0ubuntu1