Ideas are running, and I'm trying to catch them

I've had a number of ideas about this project. Some are possibly over ambitious. While originally I was keen on the idea of using Unity to create a game, I'm gone off the idea of this. This is due to the extensive learning curve in programming, while I would be capable of doing this, I simply wouldn't enjoy it as much as should.

The next idea I had and this still stands as a possibility, is to create a 3D hologram. It would also be a steep learning curve to be able to complete this, but I would be more proud of the result if I was able to accomplish it. The trick would be to create a 3D projection theatre using a wide variety of physical materials including acrylic glass, black foam board, a projector and a few more things. The trick would be to create the model and project it from behind the glass at a 45 degree angle onto the glass. Again it could be over ambitious.

The idea I just came up with, was to create an educational app. The app would be for a tablet, which is embedded in the front desk of the class room. There would be a projector under the desk. that would project onto the blackboard. I wasn't sure if things could be projected onto such a dark surface but according to a number of videos on youtube they can be.

Here is an image of the physical objects of the project.

Now what the app contains is still in question. I do intend on aiming it towards an American audience as this is a large percentage of the museums visitors.
First thoughts to the design approach of the projection is a chalk effect, as if it is actually being shown on a blackboard.