Grandus requires some complicated jointwork
Heh heh.
But yeah, if they were to actually give him any more joints, the "open cupboard" altmode would present some challenges (the "just facedown" aircraft carrier mode would be easier). I imagine he'd be pretty demanding partswise after all.
Maybe the base altmode is just him sitting legs forward, and the lower legs unfold panels to cover the thighs and form one big flat panel on which the road based stuff can be mounted. Or maybe a similar setup where the knees are double jointed and also bend forwards so the base has some more height (the torso can contribute some paneling to cover the thighs for a unified vertical base). The gunfeet can either move to the sides on a bar, or he could just have duplicate ones deploying from the waist. The torso can open up on its own to have the platforms and base works and stuff.
I guess it'd come down to how big they'd like the aircraft carrier platform to be; the surface area of that squarish shape would be Grandus' overall proportions (give or take a bit if the legs extend).
In any case, maybe they can make the Titan a package of plussed up Commander class Grandus and, say, a Leader Sky Garry. They could come with a clutch of microtrailers and their partner micromasters, and maybe an additional patrol.
I am getting quite excited about a Grandus that does not exist.