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I'm planning on expanding my army to be a full company, then up to a regiment eventually. But I don't know the rough composition of an IG company or regiment. So, erm, what is it?
I know it'll be really different from different planets (Cadia and Catachan will likely be massively different) so if I ask in Cadian terms (they're the models I'm using)

Infantry Squads > platoons > company > regiment

Tank squadrons > company > regiment

Artillery battery > company > regiment

Cavalry escadron > horde?

Basically the IG runs with squads of 10 men or 3 vehicles.

Infantry

3-6 squads > platoon
3-6 platoons > company
3-20 companies > regiment

In R.Cruddace&co's world a regiment is 1000-100.000 soldiers. Have fun .

If it helps, this is from the 2E Codex:IG, which had a section about regimental structure:

"Each Imperial Guard regiment is named after the planet from which it was raised, and is given a number which indicates which regiment it is. For example, the XVII Catachan regiment is the 17th regiment to be raised from the planet Catachan. Each regiment is split into roughly equal sized companies usually of at least 100 Guardsmen each. The number of companies in a regiment varies from two or three to twenty or thirty depending on a variety of factors such as when it was raised, the planetary population, the number of casualties and so on.
Companies are usually divided up into three platoons, each platoon consisting of a Command squad and three other squads, which may be either infantry squads, heavy squads or a combination of both. Each squad may be given its own mechanized transport in the form of a Chimera. In addition, the platoon may include additional units, such as tanks, squads from other regiments, or extra squads from the original regiment. A platoon may include as many as three of these additional units, one for each of its squads as shown in the example below."

An "important" thing to keep in mind (if you want to go by GW's fluff on the subject) would be that regiments are heavily specialised to a specific type of troops, so an infantry regiment will have little in terms of tanks or artillery, and vice versa. This is done as a sort of "power check" to ensure that individual regiments have as little combat capability as possible should they ever decide to go renegade and are cut off from the Munitorum and support of other formations. What the Imperium does when it wants to commit the Imperial Guard to a campaign is to create Battle Groups of several different regiments, and then have them mix their units on-site to create viable fighting formations. If only a single regiment is commited to a campaign, I would expect these supporting units to be assigned from other regiments prior to embarkment, so even though a battle may read "fought by the XXth Randomworld", that regiment may have included some supporting units from other regiments as well.
You could perhaps include this into your army by giving any tanks and artillery pieces a different regimental number on the hull?

Ok so if I went somewhere like this....
3-5 squads per platoon
3 platoons (maybe 4) per company
Probably 5 companies

So... 4x10 (average) x4x5 is 800.... plus all the various command structures, and any other elements like vets... *gulp*

I'll probably do the "different numbers on the tanks" to make that work as well. Thankfully it's a joint project so I'll give my friend the tanks, save my paint for the infantry

The only Company I've seen actually laid out is DKoK from IA5.

It consisted of
1 Company Command Squad
2 squads of Grenadiers (basically Storm Troopers)
10 Infantry Platoons (each with 6 Infantry Platoon Squads)
1 Heavy Weapon Platoon (4 Fire Support, 2 Anti-tank, 3 Mortar)


Automatically Appended Next Post:
OK, strike that. The 4th edition IG codex shows The Cadian 8th which shows 12 Companies (each consisting of between 2 and 6 platoons (approx. 4, 000 men)). It then goes on to mention that this is roughly half the regiment

oh god I'm in for some fun if I go that big....

Thanks though, I think 6 platoons and 5 companies is plenty for me and my Paragonian force it's hardly Cadia

I wouldn't worry to much about the size of the regiment. There is no supposed standardization, you (hopefully) will never reach a model count in the thousands, and as its 40k the numbers never make sense anyway.

I would set a company size (eg a slightly bulked up version of a modern infantry company would be 1 CCS, 3xPCS, 9xInfantry squads) and build up to that, with things like HWS, SWS, vets and stormtroopers being attachments from a fire support company or a higher level. Once you've filled out a company (which is a pretty big force) I suppose you would start company 2.

That was my process regardless, just then slowly add a squad or 2 at a time and see how high I get. I doubt I'll get past 1 company, 2 absolute most, the question was partly hypothetical anyway

Worst case, make your Cadians a veteran rgt that just didn't get rotated back into the Interior Guard yet to take on replacements for combat casualties, so they're simply understrength.

For now, that's a good plan, but I do want a large force in the end