Game about vehicles is sandbox physics construction game, focus on building and testing land, sea and air vehicles. Vehicles can be any shape, each modules can be fully customisable and it changing physics behaviour.
Now is available to create lot number of separate vehicles, switching between them is done by walking to main chair and pressing F
Will their be any sort of mountable weapons or accessories?
Now are one type of weapon - canon, but I will add few other types: machine guns, lasers, missile launchers, new types can be aim by mouse in restrictive angles.
You have to add attachers and fueling transfer systems
Good idea, attachers will be also in normal vehicles. Everything without wheels, propellers, etc; can be added to buildings, power from engines can be used, in this case to supply shield generator or advanced weapons.
I did that when there was a 1.7
Maybe add fueling stations? Gas station for combustion engine and rocket, and solar panels/station for batteries? :D
Solar panels will be new type of element. Maybe I add oil field to map, to produce fuel it must be connect to oil wheel and refinery.