I've always found that they like the corner furthest from the door and in the darkest bit, nice and secret in other words. Usually up highish off the ground is best, they queue up for it often squeezing 2 hens laying at once even though there are other boxes to lay in.
I think you may find you go to a lot of bother and they won't do what you want them too. Those balsa wood veggie boxes the local veg shop throws out are ideal and you can make a small tower so they are over a meter up and fill with hay rather than straw (for extra comfort).
A few 'towers', some big branches (windfalls) to naturalise it all and to allow them to 'hop' up, all surrounded by a simple but windproof structure should get them going.
But I don't think you'll get them to sleep in one house and lay in another. They're a bit cat like in that sense, just doing what they want, you're just the staff that put out the clean towels