Thanks CoughMist.
Sid,
What do you mean by a multisub texture or 'full' unwrap?
Basically, there is a simple cube in the middle, and 12 boxes of the same shape and size all around it on the edges. I cut off the end faces of the edge-boxes to save some poly's.
So, to unwrap it, I grouped each box separately. Then, I overlapped each side of each box to save space on the UV Map. That's why every face of the boxes on the edge are the same
Next, I took top, bottom, and pairs of both sides of the main cube and added them to the UV map as well.
The practice was that I put a 'checker pattern' over the entire texture. My goal was to learn how to proportionally make the UV map the same scale for the whole model. So I had to adjust for about 20 minutes, and finally I got the perfect scales for each section of the UV map.
I don't know if that's what you call 'full unwrap', but I am covering every face of the model.