If I remember correctly when I measured out an early 1980s Horton 500 series in early 2000, the box was 150" long, 95" wide, and 79" tall with a 68" interior headroom, these measurements would be 6" long by 3.8" wide by 3.16" tall in 1/25 scale. I went into Photoshop with the 1/32 scale drawings and figured out I needed to adjust the resolution of the photo to 65 pixels per inch which made the paper size 11.469 inches wide by 15.785 inches wide. I did the same with the 1/25 scale drawings and found out that I needed to use 86 ppi for the photo, which meant the print page size was 8.651" wide by 11.907" long.
As a test, I printed a copy of the 1/25 scale box at 86 ppi, which measured 15.2 cm (149.6"), when image file was modified for an 8.5" page width, the printed box was 15 cm long (147.6"). Of course, I'm one to use the 2.54 cm = 1 in since that is an exact measurement, and one I teach on a daily basis, so I don't use 1 mm = 1 inch in 1/25 scale
Without the true 1:1 vehicle measurements on the drawing, or a 1980s brochure, I might be off a little off in my 1:1 vehicle measurements. Do I hold this against anyone, heck no, I'm just glad that these exist.
For some modern Horton drawings, VCI Ambulances in NJ has some up, including this 553C for Barnegat Light which is a 169" long box.http://vciambulances.com/Portals/0/Rece ... awings.pdf
Now, if only there were drawings of that Ford/Swab that Charles Schultz made, I would be in 7th heaven. I've been searching for measurements to make one using a Revell 1965 Chevy for years since .