Yes the calipers will be partially inside, i tried to get with 4" backset wheel but didn't have the room on the axle tube. I think i'm about 6" now so the caliper will be partially exposed. This is on a floater hub and things take up a lot of room.
I'm going to refigure everything tommorrow, i just finished cutting the stubs off the axle tube and turned them in the lathe. I have only a few inches of axle tube to work with and think it is time to call it a night and come back tomorrow with a fresh, clear head - well. as close to one as i can get anyway.