You have to start by deciding whether you want your regiments to be logistical or tactical elements. Let me elaborate. The Imperial Guard recruits troops from imperial worlds in chunks they call regiments. In some cases, they are balanced combined arms forces, much like modern mech or armored brigades. In other cases, they are just a wrapper for a bunch of Ogryns or Rough Riders.
In the big picture, the Imperial bureaucracy does not care. They determine that 250 regiments will be moved from Sector Secundus to reinforce the defenses on the important mining world on the Rim. Then they arrange shipping and forget about it.
The general in charge of the 250 regiments does care. He gets a variety of regiments, with widely differing TO&Es, and gets to work to organize what he has to a useful OOB. First, the general organizes his major combat arms. If he has a lot of armor, he goes for an organization suitable for that. This may mean splitting up artillery regiments to reinforce others. If he has a lot of skimmers, he may use them as a big airmobile force. If he has but a few, he may split them among his maneuver elements to use as scouts. Ditto for horse cavalry.
Then, he goes after troublesome details. For example, he splits up the Ogryn regiment, puts the small groups under officers loyal to himself and sends those off to whatever regiments he thinks are prone to mutiny or trouble. The Ogryn regiment was a regiment only in the sense that an Imperial world founded it. It does not fight as a regiment.
There you have it. If you want your models to depict an OOB, it is likely to be the result of some kind of task organizing work, and is therefore likely to contain elements from a number of regiments. If you want your models to depict a regiment before some genius has gone to work on it, all the models will come from a single regiment, but the whole may well be entirely unsuitable to games of Epic.
I'd go for a mix. You have so many models that you can do it all. Create one or two "balanced" or at least somehow battle-ready forces and say that they are the 44th Chrisian Mechanized Regiment and the 63rd Heavy Cavalry. Then, based on what's left, organize a few single-arm regiments, such as the Deneb Guards 8th Artillery.
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