[Professional Engineer]

Lightsails may be more likely. Especially if we change to a design based on sending laser energy from very near the sun.

Have you read The Mote In God's Eye"? It's where I recall reading about lasers and light sails together the first time.

[NicknamedBob]

Yes, I've read that. Here's another link related to using that technology in-system to make distant worlds habitable.

Sending laser energy from the sun to distant worlds.

http://www.newmars.com/forums/viewtopic.php?t=365