I align the steps both horizontally and vertically using fine pencil guide lines then glue with PVA wood glue or Super-‘Phaltic glue.
For the channels I drill and pin the channel, offer the channel to the hull, mark the pin positions then drill and glue with PVA.
I can’t use superglue as an allergic to it, but apart from that I think superglue dries too hard and is not able to accommodate any slight movement in the wood and ends up cracking.
I also use Super-Phaltic for attaching PE parts to the model
Alan