Here are links for the 1977 and 1982 Mack Cruiseliner brochures. I hope they help with your builds. The square grille in the 1982 brochure can be obtained from AITM. They also have a 275"wb cruiseliner frame which has metal rods embedded into resin of the frame rails 4 support.
1977 brochure:
http://public.fotki....uiseliner_1977/1982 brochure:
http://public.fotki....uiseliner_1982/