Colonisation map

OK well my last idea was pretty much torn to pieces on here. Next I turn to a time period that has been covered before, but not in much detail. PLEASE TELL ME THIS HASN'T BEEN DONE!

I'm taking about the age of colonization. Specifically, just before colonization. The idea is that the game starts with 20 European powers. Part of the map will be closed off. Most of the rest of the map will be covered with neutral countries to be colonised (eg. Americas, Most of Africa, maybe Indonesia and Australia).

There will be a coloniser unit, that has a boost on "colonies". It is much easier to get colonies with this unit. Colonisation ships will have huge range. Some countries for example Austria, will not be (normally) colonising, but will be trying to conquer Europe, this will be difficult however, as every European city will have 1 high defence "fortification" per reinforcement number. Some countries such as Portugal might have extra defence to defend themselves, if they are too weak from cities.

Countries such as Portugal or Spain might start off with advantages, such as more colonisers (more could be gained from events for countries such as UK who started colonising later.

I would set it as total annihilation to promote colonising, but I may need other measures in place such as ahistorically high incomes for some colonies in order to create a game where people bother to colonise, rather than people just staying in Europe.

This would lead to a "Create your own empire" kind of game.

Similarly to the last post, this would be difficult, but doesn't really need much expertise. Besides, I have Europa Universalis 4 to help out.

OK, now start to point out why this has been done a million times before and that nobody will play this