I would use PVA glue onto a dish for dispensing with wood sticks for easy control and application , rubber bands to tighten up the walls , pegs to clamp a couple of things , model knife to clean some edges for where it is a tight fit . My tip Glue the window parts described later in the instructions at the earlier wall construction phase . Some sections fall out of the sprue so maybe rubber band them tight until ready to use . Practice before beginning to glue . Read the guide before starting