Sorry it took me so long to post this. Here is the finished entertainment center. This was really my first time making something like this so it took some time. I guess it came out ok. The customer liked it so that's good.
the center shelves on the small cabinets are attached with miller dowels, the others are pins. The center shelves on the middle unit are dado and miller dowels. The tv also slides out on extension slides to access the back. Hope that helps.