Timber crossover repairs and maintenance

I have purchased a property in the Castlemaine area. It has a vehicular and pedestrian crossover between the road and nature strip. The local council has advised that it's the owners responsibility to maintain these structures; the heritage overlay is also a consideration. Does anyone have any insights to share and/or recommended service providers? Is this something a carpenter could assist with or is it the domain of a civil engineer, as the council has indicated?

Here's a bit of background info, for context: https://www.vic.gov.au/crossovers

Thanks in advance for any helpful intel.