If you are going to build a cool desk you should build in the right computer. It should be silent, very low power, and small enough to mount in some place where you won't see it. It should drive at least 2 monitors. A laptop will not be good enough. Laptops clutter the desk, aren't bolted down, and make noise. Yes, I am being a perfectionist.
The photo shows a computer that is similar to the one I mounted under my desk at home. The idea is to mount this under or inside the RV desk. Don't buy one of those metal computer cases. They only consume space, power, and make fan noise.
This motherboard is an Intel DQ77KB (mini-itx form factor). It takes 19v DC in. It should be easy to find a 12v DC to 19v adapter to run it from the battery of the RV, but an A/C brick power supply that has no moving parts, thus no noise, is easy enough to find (logicsupply.com).
The cpu can be an i3, i5, or i7 and there are some of these that use a maximum of 35w. Mine is the i3-2100T which is plenty of speed for almost anything. The fan that you see is the only moving part. It cools the CPU, but since the CPU hardly heats up, the fan spins slowly. I cannot hear it unless I get under the desk to listen. The disk is an SSD (intel 330), so it is silent, fast, and low power. These disks come in a mSata chip that plugs into the motherboard, so the ugly cables you see in the photo would disappear if I had bought that type. The computer boots from off to useful in 14 seconds.
I have a portable external DVD player that I can plug in whenever I need it. You should be able to find an "internal" type dvd player and then mount that somewhere that allows you to get to it without seeing it much.
There are LCD monitors that are very thin and take 19v DC in. I have not looked in earnest to find one that has a removable stand so that it can be put onto a monitor arm, but I am sure they exist.
The other thing I need to find are the momentary switches and LEDs that comprise the front panel. The desk will have a switch mounted somewhere handy and hidden to turn the thing on/off, and there will be an LED that shows me when it is on.
Get a wireless keyboard and mouse so that there are no wires to ugly the setup.
Regarding the printer: it makes noise, is bulky, and eats trees. Go paperless.