Combat Engineers
2 platoons of troops (Green)
lance of vehicles
1 Company
Artillery
2 lances of Mobile Thumpers
1 lance of Mobile Long Toms
1 Company
& also Part of HQ Battalion using the 4SW Atlas TO&E templates)
SAR
1 Lance of High Speed Ground Vehicles (mix of wheel and hover)
1 Lance of VTOL
2 Platoon of Troops
1 Medical (Green)
2 Security Regular
1 Company
Military Police
3 Platoon of Motorized Inf (2 Green) 1 Regular
1 Company
Rangers
1 Company of Light Inf with specialized training Regular to Vet
1 Company
2 Lances of VTOL
1 platoon of Scout/Sniper Teams (5 member 2 S/S and 3 security) Vet to Elite
1 Company
Logistics
1 Lance of VTOLs
3 Lances of Transport Vehicles
2 platoon of motorized Inf (Green)
Support
1 lance support vehicles (2MASH, 2 Mobile Kitchen)
1 Lance of AA Units
1 Platoon of Inf (Green)
Part of HQ Battalion using the 4SW Atlas TO&E templates)
But maybe a bit more than a normal sized HHB detachment
Made a couple notes above.
Based on what is included with the "HHB" detachments that are part of each Mech/Vee/Inf regiment using the 4th SW Atlas examples.....
I would say you can actually grow this a bit bigger, but, also might want to scale back a couple things.
Your total amount of Artillery/AA I think is more than a typical regimental HHB allotment, but, also might be less than the HHB & a dedicated "Line Battery" combined.
You might consider giving those charts a glance if you have them & then can slot in some of that stuff into the HHB & fill in the main 3 "Line" battalions with "specialties".
For example, Engineers, MPs & SAR might combine 3 companies into a single battalion.
Meanwhile the remaining Rangers, AA, Extra Artillery might go into a more Vehicle oriented battalion with a single infantry company.
The Logistics/Support can probably be combined into HHB when you check out those templates which have detachments for "Security/Scouts/Logistics/Artillery" all in the HHB.
Which leaves you a full battalion or so of added troops of some specialized types.
You might also look at how the FC organizes its units.
Specialist infantry like Spec Ops but also I think maybe Engineers are in 4x4 v/s 3x3, so you could do 3 Platoons & 1 Vehicle Platoon per Company for several of your Infantry listed. (Probably not MPs)