[beng]

> 1: Its a different story for vehicles and structure, It does
> nothing to structures. While it just make the vehicle nudge
> abit and make it look strange.

It is dependent on the mass in physicsbehavior. Since vehicles have more mass, they only nudge a bit. To make them move more, increase the flingforce.

As for structures, they have no physicsbahavior so they don't move. If you add physicsbehavior then they can be moved by forces (or locomotors, though that also needs an AI module).

> 1: I don't get why all of the vehicle add-ons (like the overlord
> gat cannon) have the "PlacementView - *insert angle here* "

That is used when you place them in worldbuilder. It is not necessary though.

> 2: Hulks have the Upgrade cameo and portrait fields

I suppose that is in case they are made selectable. It doesn't hurt to have those fields.

> 3: Add-ons have upgrade cameo fields. example: Avenger's
> turret have the upgrade cameo of the propaganda tower etc,

Again it doens't cause problems, although it isn't used since you never select those objects.

About the GC_Chem and GC_Slth etc, those were never finished and are not intended to be used in the game. If you use them, they come with bugs like those you mentioned. The battle bus of the GC_Slth is supposed to disguise like bomb truck, and also be able to throw out demotraps, it does not work.