I’ve never personally used Quickest to make glue set up faster. On my current tank I used the drill and dowel technique. I used fiberglass rods to hold the rock together. On my new build I’ll be doing the same thing with the addition of mortar in some places! In my current tank I only have three rock structures with negative space. It is fairly minimal. I wanted good flow around everything, plus the ability to vacuum around all structures. I attached and older picture to see the rock better. The tallest structure in the middle is basically two rock. The structure on the right is also two rocks, with the smaller rock being on top where the hammer is mounted. The rock is also drilled in multiple places using an 1/8th inch masonry bit for “pegging” Corals. All of my frag disc that the corals are glued to are drilled in the center of the disc with an 1/8th inch hole also. Then a piece of 1/8th inch acrylic rod about an 1inch long is glued Into the disc. This makes moving corals around pretty easy if necessary. Just move from one hole on the rock structure to another.
