Found an old (1960s) Campbell Produce Shed kit on Ebay about a year ago and finally got around to building it for the layout. The prototype existed in Yorba Linda California for many years, and since I'm modeling southern California it seemed like a natural. It arrived from the seller missing a few pieces, but nothing that couldn't be easily replaced; so I more or less followed the original instructions but substituted more modern detail parts wherever it was possible.
The way-over-scale Campbell windows were replaced with similar-sized Grandt-Line parts, and Grandt-Line NBW casting were also used here and there. The campbell paper shingles were replaced with Northwestern HO scale corrugated iron roofing sheets, A-Line supplied an air- conditioner, Walthers some roof turbines and the unpainted Preiser figures, and Sequoia made the plumbing pipes, a new heater vent, a bunch of fruit boxes, and an electrical meter box as well. I added a coiled-up hose made from very light insulated copper wire, an aluminum- tube roof-drain downpipe, and a couple of birds on the roof as a final touch.
The floor is not painted, just stained a variety of colors to look like a 50-year-old and hard-used floor. I mixed my own paint colors to get the blue, off-white, and light grey color-scheme I wanted, and used four different shades of red-browns over a dirty grey to duplicate the mottled colors on the rusty old corrugated-iron roof.
The Campbell-supplied signage was just printed paper with black lettering on a white background, and looked toy-like; so I made my own signs from sheet plastic and balsa and painted them black with white lettering: a commercial style that was ubiquitous in California up until the early 1950s.
Doesn't look bad for a 50 year old kit, and it captures that distinctive "California commercial architecture" look that I'm trying to duplicate on my layout.