Not a bad start, for sure! I'd also suggest a few more conventional-feeling units to flesh things out- frequent Blakist units include the Nexus, Raijin, Grand Crusader (though the mini isn't great, honestly), Legacy (a must-have), Buccaneer, and Gurkha. Anything used regularly by Comstar prior to the schism would work too (so, essentially anything in Comstar's arsenal outside the Viking and Beowulf. Comstar kind of stopped caring post-'58, it seems). In that regard, the old TRO:2750 becomes almost a shopping list.
Really, you could even sneak a Clan unit or two in as salvaged units if you so desired- a Thor or something like that, but don't go overboard on it. The salvage from the Dragoons on Outreach had to go somewhere, after all. That would also include Dragoon-regular designs like the Imp, Falcon, and Zhukov, if you want to go that route.
And, of course, there's no reason you can't flesh things out with units from other realms too- by '70, the Blakists had been running the show on a few heavily-industrialized worlds for a while, so they were likely reaping the benefits of places like Hesperus or Irian for all they were worth. Think of it less as a 'would my unit have access to this unit?', and more 'what story can I create for HOW my unit got their hands on it in the first place?'- doing that, you can have some real fun. That Kodiak? Yeah, we raided the Bears last fall and it got crazy- but after the MD infantry pulled the local Star Captain out of her Mech (literally), all it needed was a coat of fresh white paint... well, that and the cockpit hosed out. Those two Heavy LRM Carriers? The Taurians never knew what hit them when we hit their rear areas during their counterattacks- these were our prize afterwards.
Keep it reasonable- you might have trouble explaining a Blood Kite or a Von Rohrs- but sometimes the stories you create to back up a unit's creation end up really helping to forge them from a collection of record sheets and painted metal into something truly meaningful.
...Oh, and get a couple of SRM Carriers. Then look up the Blakist model with the Streak SRM racks. You'll thank me later.