The showcard will also be the place to hook up most of the internals in the projector.
All the modulation signal for the different colored lasermodules, The ILDA IN and OUT signal, the DMX, Microphone, and the potmeter for the sensitivety of sound. I`m not quite shure the card shown in the picture have the SDCard option, but for shure, there are no SDcard reader in the packet.
Be aware that all the wires that comes with the set are stiff an fragile. If you can make new ones out of better quality wires, do so. It will save you trouble later. (Speaking out of experience)
For the dough, these might do for some beamshows, but do`t have high hopes for graphics.
You have not written anything about what source of light you plan to use, but stay safe. All Lasers, regardless of power must be considered dangerous.
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More projects than time available.
More projects started than finished.
More money spent than earned.
More failure than success.
Just got to love lasers!