That gives our revised time vs acceleration table, with delta-v added:
Rolling out the Tsiolkovsky equation we can work out the engine exhaust velocities we need for a range of mass ratios (that is, mass at the start of the transit over mass at the end)
|m0/m1||0.1 g||1.0 g|
These are high. but not inconceivable, velocities. Basically, we have to master some pretty fancy fusion technologies to make it work. I'll have to do a detailed wok-through to see if I am on the right track, but so far the only outright impossibility I am talking here is still FTL.