I too have seen some adding doors to the area and then using the doors to support the HDTV. Adding shelving inside the area and mounting the HDTV on the inside cabinet wall looks great too.. Mount a full shelve on the bottom and then mount a inside wall swivel Inside the area and allow the HDTV to remain inside the cabinet perhaps... Use the bottom shelve for the DVR etx... Do a search on google with different wording should give you pictures what others have done...
When i did mine with my 5th wheel trailer I found a shelf kit at LOWES called CLOSETMAID and made a nice looking bottom shelf and then used a side inside wall swivel mount to support the very light HDTV - repainted to match paint color...
Roy Ken