The real question would be what you want to do. Bayonet Strength is very good site what platoon thru battalion firepower levels should be. Sort of a "men behind the counters' sort of thing. Since PG works best at a brigade combat team sort of level, Bayonet Strength covers the infantry components very well.
For larger formations start with
WWII Orders of Battle and Organizations. The problem you will find there is that it starts at the company/battalion level. Another thing, some formations are designed to be, and some armies operate in, rather amorphous structures. The background information you noted in Arctic Front might be considered somewhat of an institutional suggestion during the Winter War period. You'll other examples, like American combat commands.
Another good source is
The Nafziger Collection of Orders of Battle. It will take a bit of searching. Again it usually starts at the battalion level.
That should get you started. Let me know if you really want to burn out your brain.
