Jerome, I have no idea if that's the way it would really be done either but it makes mechanical sense. If you tried to lift the hood with just the lifting rings, I think you would end up damaging the fans and sides of the hood. When they're being shopped, a traveling crane is direcly overhead so it can lift straight up using the bolts. With a crane lifting from an angle, some kind of support to keep the chains even and straight up from the anchor points would seem to be the only way to do it. I've seen a similar type of thing for lifting precast roof panels and it just looks right to me. Any railroaders here who've seen how this is done in real life?