Thank you all for your input. A mixed regiment it will be!
Now, given the fact that I'm going with 7 infantry companies, 2 mechanized infantry companies and 2 armoured companies (also, change of plan: a recce company will be added to this all), how should I go about this in more detail?
Infantry Companies: made up of Infantry Platoons
Mechanized Infantry Companies: made up of Infantry Platoons with Chimeras
Armoured Companies: made up of LRMBTs, Exterminators, Vanquishers, Conquerors, Destroyer Tank Hunters
Recce Company: made up of Sentinels and Salamanders
That was all pretty plain sailing, but leaves me with two tanks unspoken for: Hellhounds and Demolishers. I was going to incorporate Hellhounds into the recce company and Demolishers into the armoured companies. But then it was brought to my attention that these two belong in a siege tank company. What's your take on that?