Looking through the National Archives last night I noticed they have various diagrams relating to our older bus shelters.
When looking at the item, select enlarge to get a much better look ;)
Generic bus shelter design for the ACT 1946/47
Proposal Perspective - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797386
Detailed design plans - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797387
More design - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797390
Further design - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797391
Sign Lettering Details - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797420
Mulwala Hostel 1948/49
Design of Shelter - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7693418
Detail roof design - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7693419
Location - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7693420
Stuart Street and Strzelecki Cres, Narrabundah 1950
Site Plan - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797403
Weston Street between Novar St and Mueller St Yarralumla 1950
Site Plan - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797401
Oaks Estate Bus Shelter Hazel Street 1950
Site Plan - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797405
Ried House and O'Connor (Westgarth Street after Tate Street) 1950
Site Plan - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797404
Kingston Giles Street 1955
Detailed shelter design (love the location sign on the shelter!) - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797407
1958 Shelter Design
Detailed Design plan - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797412
Ried Methodist Church Coranderrk Street 1944
Removal of shelter site plan - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797419
Forrest Arthur Circle 1937
New position for bus shelter on Arthur Circle - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797433
Forrest National Cct Shelter 1944
Shelter design and location plan - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797421
Mount Stromlo 1936
School Service shelter design - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797437
Narrabundah Kootara Cres opp "15th" street 1955
Shelter Design Plan - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797408
Design plan with Toilet - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=7797413
The ACT Heritage Library has a few other plans available to view at the library in Woden including Acton Offices, North Ainslie (including floor plan), site of shelter at the Lodge, shelter for Narrabundah demountable s, among others.