Turning some colonization stuff into BTS

I have some ideas for a mod but want to include some of the things that come with colonization in it.
I want to have native civs without borders nad a europe area you can sail to. Is it possible to make it into BTS?!?!?

Leaderheads and civs have already been incorporated into BTS.

Native civs without borders could be done, but I suspect it would be hard to let them work the land (and therefore grow their cities).

Setting up the colonization style Europe is another story. Perhaps an expert python modder could do it, but I suspect it would be very very difficult, if not impossible, to make the BTS AI use it properly.

Perhaps it´s better to make the mod in colonization although it has nothing to do with colonization, it´s the game maecanics I relly want.
And if I do the mod in colonization I need tons of new graphics for units, buildings, leaders and cities...