Working my way through the unit list on Warrenborn and the Dossier cards . . . was it DFA and after that had the lance/star listings?
For the Swordsworn, Dragon's Fury, Highlanders, Bannson's Raiders and later Stormhammers should each 'regiment' be considered something like a LCT- 1 mech battalion, 1 armor battalion, 1 infantry battalion, some air support? Same deal for the Clan clusters- 2-3 mech trinaries, 1-2 armor trinaries/binaries, 1 infantry/BA trinary, ASF/VTOL binary? Pretty sure none of the mech forces would have formed as a Nova.
Understanding that what is provided in Era Digest Dark Age is a snapshot as of Dec 3134 and while it gives the strength of each unit it may be that each is either under or over their 'paper' strength. For instance Aaron Sandoval's Davion Guards is listed at two battalions . . . which could mean the paper regiment is at 66% strength, each of the 3 nominal battalions is missing a company either in whole or spread across the battalion.