You are Right Japhir, but while im working this way im already thinking before time how it will end up looking when its downscaled. to get the best crisp details though you must work at original res.
with stuff this lowrez, it's usually better to work on the actual resolution so you don't get a washed out look after resizing. but that's only AFAIK. http://www.poopinmymouth.com/tutorial/resize.htm