>Can I set up all the frames in my brood box with a beveled top bar or starter strip and just let them build their own comb?
Yes. With other benefits:http://www.bushfarms.com/beesnaturalcell.htm
> Or do I need to give them some kind of foundation?
> I would like to let them build all of their own comb throughout the hive, up into the honey supers.
Then give them a guide and let them.
> When I get to where I can harvest honey, is it ok to use that comb to crush and strain and have them rebuild?