Assembly is Simple Join end to end Window slides in from end End Caps Seal Each End   The Clear vinyl windows we provided as part of the system easily slip in from the side for maximum dust protection. Note: Our Vinyl windows are more flexible and more scratch resistant than Plexiglas (Lucite) material. Glass windows are very heavy and are prone to chips and breakage.   These displays are Aluminum, not wood. As we have found, and most of our customers would agree, that wood has limitations. These cases are not as heavy so your walls will remain relatively damage free, forever protecting your investments!   These are the Best Display case System in the USA and beyond. Your satisfaction is guaranteed!