You might consider introducing the ancillary sci-tech topics after you've been up a while - it's really important to focus on a tightbeam signal for your first stage. If all the articles you generate begin to look more sci-tech than Mac-centric then perhaps you concentrate on that.
It'll sort itself out as material is compiled.
For what it's worth I'm friends with one of the hosts of RetroMacCast, a podcast that's been running for about 12 years, focused on ANCIENT mac technology.
I'm certain they have existing affiliations with one or more Mac-oriented websites but we might be able to get a shout-out to get some attention once the site is ready to seek traffic.