A laser power supply is typically 2500 volts or more. A qualified person must do it. Better yet, buy a self contained laser or one with cable to the power supply included. Film is less expensive but more difficult to use. A sturdy table and sturdy bases and mounts for the laser, the optical components, the model, and the holographic plate .
Concrete blocks make good bases.
Lenses and mirrors should be mounted on rods or clamps which, in turn, are mounted on short ring stands with a triangular bases. Other mounts can be used as long as they are firm. It should have a uniform stable temperature . They should not shine directly onto the light sensitive surface. It is reported to be less hazardous.