There are nearly an infinite number of potential housings for this type of setup, a quick browse of Craigslist or Etsy
will surely inspire you.
Vintage piece of furniture: although the components are relatively small, don't underestimate the space needed for the all the pieces and the wiring. Height should also be considered because you will likely have to move it to the middle of the room get the right distance from your projection wall, and you probably don't want to be projecting on the bottom half of the wall. I chose the "Pianorgan I", I am assuming there is a Pianorgan II out there somewhere.
Computer speakers. I had a 12 year old set that was yellowed from the years, yet still puts out enough. In terms of Db per $ these are hard to beat.
Mini or Pico Projector. These are getting more powerful and cheaper all the time: for this reason, I would look for a sale on a relatively recent model. After some research I settled on the Dell M110 which provides a good ratio of lumens and resolution per $.
Video adapter for your smart phone: most recent models have a connector sold separately which has HDMI out for 30-80$.
You will need some tools to dismantle the Pianorgan as well as your computer speakers. A set of tools for gentle teasing apart (a set of mini screwdrivers), and in many cases you will need to take a more primitive approach (hammer and chisel). Some connectors may be needed to get the speakers back in working configuration. I also used a hole saw and hand drill to make the holes for the projection and air-intake.