Heh, kinda but not really. I build a similar div but with Mot, not Mech. Mot is cheap, spammable from the start of the game and requires much less fuel and supply so it doesn't bog down the front line when I spearhead with my armor divs. I would suggest starting with Mot and slowly change 1 Mot battalion at a time with Mech as you produce more, but make sure you prioritize changing your Mot battalions in your tank divs first.

It's good for defending against inf, but very expensive in IC and fuel for its purpose. Too low breakthrough for an attacking div. It will succeed in pushing simple infantry divs but will take a long time to do so, eating your fuel. Look at the hardness ratio, this div will get shredded against a proper armor div even on defense. Either add a cheap line tank that has a lot of breakthrough for pushing simple defense infantry divs easier/supporting your armor divs on attacks, or add AT for more hard attack and piercing so it can stand a chance against armor divs and at least negate the armor bonus. Careful with that low Org and make sure you spend that army XP on doctrines.

As a personal rule, if I have line battalions I don't add the support battalion as it reduces your org too much for the added value. Either remove the line AA or support AA, don't add both. I'd remove the line AA. Since this already has 2 line arty, I'd remove the support arty.