external memory interface to use different peripherals on Arduino Mega

frank26080115:
There's nothing stopping you from doing it, go try it out.

The description of the forum said, and I quote, "shields you are designing or that you think would be nice to have, Arduino compatible platforms, board comparisons, etc.".

Telling me o do it, is a bit against the purpose of this, isn't it? That being said, can I borrow a welding machine for the Wiznet chip and others like that? Because that kind of is stopping me from doing it.