Hello James, how're you?
We've gone through a similar investigation and it can be interesting.
The 19th Century Volunteer was a socialable person, encampments and activities were widely reported in the newspapers of the time. We're fortunate that Australian newspapers are available online and for all districts, though if yours are available to you they're a great source. Most encampments or activities were also visited by any number of groups from the Salvation Army and Suffragette movements so thats possible.........and any form of civvy from magistrate to the local copper thats likely to have walked in and out of a volunteer activity as well if that appeals.
A number of volunteer groups were formed locally here in the form of VAD groups or St Johns Ambulance as well, life saving groups too equipped with forms of Hales rockets so the world is your oyster.
Signal & signalling equipment here was supplied through a private company which was a early form of Telstra, now the current Australian national carrier of telephone and communications.
Any number of sub military groups can be sourced such as submarine miners & engineers though for our own money, we're settling on a Staff Corps group. My own state, Queensland was divided into two military districts, north & south and at one stage north Queensland was looking to succeed from the rest of Queensland but my point is that two sets of staff corps oversaw the activities of the volunteer units of naval detachments, mounted infantry, cadets, bands, infantry of course, artillery, etc so there's a wealth of portrayals. Now I realise all this is peculiar to the colonial soldier though they attempted to base themselves along UK lines.
Good luck, I look forward to the photos.