It appears that the designer of the MMTB Roll of Honour was a young artist of growing reputation, who became well-known as a water-colourist and draughtsman. In 1922 he toured abroad, including the Middle East, and his art shows were well-patronised. In 1941 he was appointed as a War Artist to accompany troops to the Middle East. The illustration above dates from that appointment, and was included in the book Active Service: with Australia in the Middle East. He returned after a few months saying that he felt younger artists would be more suitable. He had struggled in the hot temperatures with the heat drying out his water-colours too quickly. Herbert died in 1945 aged only 52 "after a long illness", so one might surmise that he had been unwell during his time with the 2nd AIF.
I have created a number of local history projects for which you will find links on this blog. I am a community historian (ie, not paid) living in Essendon. The content of my Empire Called database (see the link to the PBWorks website) is the result of nearly 25 years' research. I began collecting material for the database of local WW1 volunteers in the early 1990s, beginning with hand transcriptions of Honour Boards in local schools, churches, clubs and so on. It was after this that the National Archives of Australia began making digitised service records available online, followed by the Australian War Memorial uploading Embarkation Rolls of the Australian Imperial Force. The Empire Called blog is a companion for the PBWorks website of the same name.
Time Travellers in Essendon and Flemington is set up in the same way, with a website and a blog to report additions to the website. The website is a vehicle to publish longer pieces of research that are too long for newsletters. It also includes various indexes I have worked on for many years, plus photos from various sources which I date and describe in greater detail. You may find something of use for your research.