This Signature Models' 1:50 model of a 1960 Mack Fire Department Rescue Truck might have been designed to be converted to streets. The body did not have to be cut or trimmed in any way. I lengthened the chassis of a K-line step van by about 18 mm, and with only a tiny bit of work, it not only slipped on well, but I found a way to mount it so that I could keep the original cab interior in the body. This is really a beautifully-rendered model and it looks spectacular on the layout. Despite the longer wheelbase it isn't too grumpy running through D-16 curves - the new body weights two ounces less than the original, so I added 32 pennies (3.0 ounces) in a roll mounted above the rear axle so it has really good traction now.
Its just a lovely model . . .
Opening doors, and an interior, and driver. How cool is that?
it runs very well, too . . . and looks spectacular doing so.
[unlike my 1960s Playboy subscription 
