Principles:

general

Compose service names will become the service's addressable hostname. They should be globally unique (see examples in docker-compose.yml files)
A user-defined bridge network is used for container-to-container communication
Traefik is used as a reverse proxy for host-to-container communication
Traefik also configures the TLS layer and uses a local.inseng.net cert

Service name should be globally unique and end in local.inseng.net. See docker-compose.yml file examples
Bind server to 0.0.0.0. This allows other containers to just make a request to the default host name for a service.
Have the server listen on the container's port 80 for requests.

Create a loopback alias for your host and containers to access to avoid loopback confusion (sudo ifconfig lo0 alias 192.168.42.42)
Create an bridge network for all services to use (docker network create test-net --gateway=172.26.0.1 --subnet=172.26.0.0/16)
Specify the default network in all docker-compose.yml
Use a standardized compose service name ending in local.inseng.net
Use dnsmasq to point *.local.inseng.net to the loopback ip (192.168.42.42)
Generate certificates for *.local.inseng.net by using traefik/scripts/generate_certs.sh