We finished this a couple of months ago, it's a different RV ( 2003 Holiday Rambler 29RBD ) but I think I did essentially the same thing.
Pictures posted here on Google Plus so everyone can easily see them in small or large sizes.
https://plus.google.com/photos/101533552838802518081/albums/5877284921502577841?authkey=CLCHnLu_4Z39jgEWe removed the old 24" Tube set and discarded the trim piece. Then, we cleaned up the interior, putting wood on the back and the top to make it look a little better.
We hired a carpenter ( my superpowers involve computers, so I needed help with this part to keep it from looking like a hack job) to build a door and shelves inside the cabinet. The shelves can be moved up and down to some limited extent, limited by the taper of the space and the different sizes of the shelves.
We moved the 120V power off the side a little bit and added more outlets, at the same time removing the relay that used to turn off the TV when the ignition was turned on, so devices could still use 120V power while in motion. I also added four 12V outlets to run the TV, plugging in two USB 12V adapters to charge cellphones, tablets and run the 4G hotpot.
We mounted the door and added a hole for cable pass-through, then:
a flat screen mount
http://www.amazon.com/VideoSecu-Monitor-Mount-Maximum-Loading/dp/B000VKCIJU/ref=pd_sim_e_6a 12V Supersonic 24" LED TV
http://www.amazon.com/Supersonic-SC-2411-Widescreen-1080p-Digital/dp/B007FH8OZY/ref=sr_1_1 which came with both a 120V power adapter and a 12V cigarette lighter plug. It's got two HDMI inputs, an RCA input, USB photo capability and audio out through the stereo.
Lift-o-Mat door supports
http://www.amazon.com/gp/product/B004PGAQGS/ref=wms_ohs_product?ie=UTF8&psc=1 and finally door latches
http://www.amazon.com/gp/product/B002XM592M/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1The existing stereo in the dash seemed to work OK for radio, but the RCA inputs sounded very distorted. So we replaced the old stereo in the dash with a new JVC with Aux inputs for sound from the TV and bluetooth inputs for music and audiobooks, as well as bluetooth phone capability.
http://www.amazon.com/gp/product/B0079LGMYG/ref=oh_details_o00_s00_i01?ie=UTF8&psc=1 Amazingly, the new stereo had the same plug on the backside as the old one, making the installation one of the easiest I have ever done.
On a trip to WI, we discovered that the TV mount lets the TV rattle a little more than we'd like, but a couple of pieces of foam stuffed behind the TV tensioned it enough to stop the rattle.
The door lifts are strong enough to hold the TV up for easy access to the space behind the TV, which was previously "wasted" on the back of the old TV. We refer to that space as the "server room" and it's got space for both of our laptops and 120V power for charging them. We'll probably invest in 12V laptop adapters before we hit the road full time.
We pondered putting a blu-ray or DVD player on the top shelf, but so far we haven't seen the need. With an extra HDMI input, we can use one of our laptops for playing movies and I've got a Google Chromecast on the other HDMI, giving us Pandora radio and Google Music over the 4G and Netflix when we've got outside WIFI.
We're pretty happy with all the new storage and a space to store and charge the geeky toys. The Supersonic TV, while not a well known name, has a pretty good picture that's visible from all the seating in the RV and I like the 12V power option. The stereo is great - excellent reception and bluetooth audio keeps us entertained with audiobooks from my wife's phone or tablet while we're driving.
Eric
2003 HR 29RBD/2006 Liberty CRD
Big Pine Key, FL