tl;dr: Old idea. Accelerate half way there at g, decelerate the rest of the way at -g. No way to do this with current or even remotely foreseeable engine tech.

tl;dr: Old idea. Accelerate half way there at g, decelerate the rest of the way at -g. No way to do this with current or even remotely foreseeable engine tech. Nothing to see here, please move along.