You could easily spend many thousands of dollars on a custom built cabinet with Pop Up TV Lift, but for about $500. You could spend more, depending on the ready-to-build furniture you buy, but ours was quite inexpensive. Its the ideal Home automations project
Step 1: Build the main portion of the cabinet
Our cabinet had a middle support that had to be trimmed to allow the Pop Up TV Lift and the LCD TV to fit in.
Step 2: Liftable top or hinged
I've heard of people having a section of the top lift straight up with the TV, you'd just need to have a bracket or something to attach the top of the lifting column to the under side of the cabinet top. Either way will work, as long as there's an opening for the TV to come out of. Kind of pointless otherwise! ;-)
So we cut a portion of the top based on how far out the TV lift column and the TV came.
We then used some 2x4 attached on the inside of the cabinet on either side for the hinges to attach to. Make sure you drop the 2x4 down a touch to accommodate the hinge so the cabinet top can still be flush with the hinges attached (see photo).