Although I’m not a diesel fan, here’s what a quick search at the Index of Magazines turned up, using the keyword search term “E5”. Maybe you’ll find the needed dimensions in one of the cited articles:
Burlington EMD E-5 A&B-1939, Railroad Model Craftsman, February 1964, page 34. ( CB&Q, DIESEL, DRAWING, E5, “KAMM, AL JR.”, ENGINE, LOCOMOTIVE, PROTOTYPE, RMC )
Electro-Motive Model E-5 2000 hp. - 1940, Loco 1: The Diesel, page 68.
( DIESEL, DRAWING, E5, EMD, ENGINE, LOCOMOTIVE, PROTOTYPE )
Forget the gods of old, Trains, October 1978, page 58, a fast ride behind Burlington E5s. ( CB&Q, E5, FRONTISPIECE, “MORGAN, DAVID P.”, TRN )
Electro-Motive 2000-hp. passenger cab unit, models E3, E4, and E6, Model Railroader Cyclopedia - Volume 2: Diesel Locomotives, page 70. ( ATSF, B&O, C&NW, CB&Q, DIESEL, DRAWING, E-UNIT, E3, E4, E5, E6, EMD, FEC, IC, RI, SAL, SR, UP, ENGINE, LOCOMOTIVE, PROTOTYPE )
Performance Test Report #43: Oriental Ltd. EMD E5A, Model Railroading, January/February 1984, page 6. ( DIESEL, E5, EMD, “HIGGINS, ROBERT”, ORIENTAL, PERFORMANCE, TEST, ENGINE, LOCOMOTIVE, MRG )
Athearn Power for E5, E6, E7 and E8 Diesels, Model Railroading, February 1987, page 21. ( ATHEARN, DIESEL, E-UNIT, E5, E6, E7, E8, EMD, “HIGGINS, ROBERT”, ENGINE, LOCOMOTIVE, MRG )
EMC’s Early Passenger Diesels Part 2, Diesel Era, July/August 2000, page 9, Part 1, Nov/Dec 1999, covered boxcabs, custom-built units. ( ACL, ATSF, B&O, E3, E5, EMC, “ERA STAFF, DIESEL”, PHOTO, ROSTER, DE )
EMC’s early passenger diesels, part 3, Diesel Era, November/December 2000, page 28, photos,rosters C&NW E2s, E3s, E6s and CB&Q E5s ( CB&Q, DIESEL, E-UNIT, E3, E5, E6, EMC, EMD, ROSTER, “STAFF, DE”, ENGINE, LOCOMOTIVE, DE )
From Streamliner to Streamlined Diesel, E Units: Electro-Motive’s Classic Streamliners, page 4. ( DIESEL, E-UNIT, E1, E2, E3, E4, E5, E6,