Sibs are really light, but poor ocean conditions can lift half my 4m of chain off the bottom. I can't imagine having any less chain since my boat needs to be at the surface waiting for me where I left it when I return from scuba diving. My anchor is an 8lb (3.62kg) Hooker Danforth style anchor. I have 310ft (94 meters) of anchor rope.
To connect the anchor to the boat I built a bridle that goes from the two d-rings in the front into a loop that passes thru the bow eye. From there I tied a loop into the end. The reason for the loop in the end is that in case one of the d-ring breaks loose, the other will hopefully continue to hold. Thru the loop I pass a locking carabiner, and at the length I want I create an overhand loop in the anchor line, then toss the whole thing overboard. So far it has worked well.
My anchor and line are stored in a milk crate turned sideways in the bow, that is mounted to the front wooden deck (Aluminum rear decks) with eye bolts and held down with giant zipties. It just gets fed (Dropped) down into the milk crate, which is breathable, and so far has not tangled. I do tie the end off to the milk crate and figure if I ever flip the boat the anchor will hopefully self deploy but I doubt it, since the anchor ends slip tightly into the milk crate. Also with the anchor tucked into place it never flies out of place no matter how rough the water gets.
Scope: yeah I use some. It depends on how much wind chop there is, but rarely do I use more than 3:1 and sometimes less if the conditions are benign. I often anchor in 100ft of water and carrying 600ft of rope would be ridiculous. We dive in calmer conditions not hurricanes.