I would think just using screws would be fine but if you never plan on taking your bar apart add a little glue also.If item five is the 85″ back supprt for the floor I did glue and screw mine to the (scrap) pieces used for spacers. Don’t forget ,the plans are made for an “easy home bar” that you can disassemble. If you don’t see yourself ever taking the bar apart to move to another house then, use a little glue. Trust me if done right these bars look great, people will want to keep the bar in the house if sold. Anyway , the bar is heavy but nothig 5-6 frieds and a fridge dolly couldn’t move.