All of my backup engines and cars are in cabinets with doors, one with a plexiglass door for display, so dust is not much of a problem for those items. These items are rotated to the layout on a regular basis. I also use several of the engine size display cases.
For my 8ft. X 16ft. layout, and with 2 cats and three litter boxes, I didn't have a choice but to keep the layout covered. Whoever came up with the idea that litter is 99% dust free was out of their tree. What I did was to attach 4 sheets of heavy plastic a little larger than 4ft. X 8ft. to the sides of the table. I attached 1" x 1", eight foot long trim pieces to the other side of the plastic. I have removable support blocks on the table and simply swing the plastic over the table to uncover or cover it. Takes only seconds and works great. The cats are gone now, but I still use the covers. Even with the covers, I still need to dust items once or twice a year, as the litter dust will probably remain in the basement forever. Slime works excellent for getting dust off of detailed items.
