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Hi @jasejw,
You could use small angle brackets on the inside of the top mitre joints to strengthen them. These will be hidden by the drawers. The same approach couldn't be used on the bottom as they'd be exposed. In the guide, they set the nail gun to drive the pin nail a millimetre below the surface and then use a timber putty over the nail holes. Since the brad nail heads are so small, the putty will be just about unnoticeable. Puttying over brad nails is a fairly standard approach in cabinetry construction.
With the wall mounting, they have eight fixing points into the stud work and are using bugle head timber screws. These are long, coarse threaded screws that are capable of holding a large amount of weight. Even a single screw would hold over 100 kilos if fixed into a stud. You could certainly make your own modifications to the design to improve the mounting of it. However, even if you were to use brackets, they'd still need to be screwed into studs. Commonly the hole sizes provided on brackets are for standard smaller screws. You'll get brackets with multiple holes, so having two fine-threaded smaller screws on a bracket could be more effective than one larger coarse-thread screw.
Please let me know fi you have any questions.
Mitchell
