My input?
Yes, you will need a propulsion system. Gravity control is definitely a way to do this. One would hope that you could generate the energy that the vessel would need, as well. I think those two are the "givens" that are really making people struggle right now.
But there are many ancillary items that need attention. Consider radiation shielding. I doubt that early attempts are going to achieve any trans relativistic or FTL type capabilities (not without some deaths, anyway). So shielding from things such as debris, even the atomic sized, is critical. As well, you would need to ensure a self healing skin of some sort to repair the ship from the bombardment of such debris and radiation.
Regardless, here is my 2 cents on "anti-grav" tech:
Dr. Ning Li -
http://projectavalon.net/forum/showthread.php?t=1785
And Dr. Robert Baker (and the High Frequency Gravity Wave work he is doing with China, on behalf of the US taxpayer) -
http://www.gravwave.com/docs/Chinese...%20Project.pdf
http://www.drrobertbaker.com/docs/US...84591%20B2.pdf
Quote:
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A gravitational wave generating device comprising an energizing means which act upon energizable elements such as molecules, atoms, nuclei or nuclear particles in order to create nuclear reactions or collisions, the products of which can move in a single preferred direction with an attendant impulse (jerk or harmonic oscillation) of an ensemble of target nuclei or other energizable elements over a very brief time period. The target nuclei or energizable elements acting in concert generate a gravitational wave. A preferred embodiment involves the use of a pulsed particle beam moving at the local gravitational wave speed in a target mass, which is comprised of target nuclei, to trigger a nuclear reaction and build up a coherent gravitational wave as the particles of the beam move through the target mass and impact target nuclei over very short time spans. An information-processing device connected to a computer, controls the particle beam's high-frequency, (GHz to THz) pulse rate and the number of particles in each bunch comprising the pulse in order to produce modulated gravitational waves that can carry information. A gravitational wave generation device that exhibits directivity. A gravitational wave detection device that exhibits directivity and can be tuned. The utilization of a medium in which the gravitational wave speed is reduced in order to effect refraction of the gravitational wave.
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http://www.americanantigravity.com/a...ves/Page1.html
http://www.gravwave.com/
And Douglas Torr:
http://www.theyalltoldthetruth.com/id53.htm