This is my general aim for things. But then, I don't like using ramps. Stairs are so much easier to work with!
_______________entrance________________
_forest__farms__stairs__farms___forest_
______barracks__stairs__barracks_______
_______storage__stairs__storage________
_____workshops__stairs__workshops______
__dining rooms__stairs__dining rooms___
______bedrooms__stairs__bedrooms_______
______bedrooms__stairs__bedrooms_______
______bedrooms__stairs__bedrooms_______
___noble rooms__stairs__noble rooms____
_________tombs__stairs__tombs__________
/////MINING/////stairs/////MINING//////
/////MINING/////stairs/////MINING//////
/////MINING/////stairs/////MINING//////
/////MINING/////stairs/////MINING//////
/////MINING/////stairs/////MINING//////
/////MINING/////stairs/////MINING//////
/////MINING/////stairs/////MINING//////
/////MINING/////stairs/////MINING//////
*****CAVERN*****stairs*****CAVERN******
********FUN*****stairs*****FUN*********
Also, 4GB!? An hour and a half!? Did you record your entire playthrough? xD Man, I spent about 12 hours doing my turn, it'd be crazy boring as a video. Did you talk through the video and record that, too? That would be interesting. But probably not interesting enough to warrant an hour and a half of listening. Definitely would cut it down to 30 minutes or so, tops, and post it in ten-minute videos turn-by-turn.
But then, I'm terrible at editing videos and I don't think DF really shines when it comes to that end of things.