There are a couple of proviso's like what type of beam you are using and only a single beam, they describe it as 2 bay and 3 bay. I reckon that's where the eguide will come into it's own, as long as you are using compliant material, it works out how many lifts you can support before you need another beam and if you need double standards or not. The only small disappointment is that you can't cantilever a beam from 2 independents to form a corner if you know what I mean. Other than that, it looks pretty good.