We haven't done this ourselves, but I know lots of people who have. It can put an enormous strain on relationships, with one partner away half the time. Also I think the fact that you're a single mother the weeks he's away really puts me off - that might not be so bad if you have plenty of other support around you. I think it's hard for the partner working away too, missing so much of their children's development.
Don't want to be a downer - obviously there are upsides as well (like the times when he's back, for instance) - but I've told DH we are not doing this. I couldnt' cope with him being away so much of the time.