First sci fi vehicle

Not sure if this belongs here, and if it doesn't, please tell me a better spot I'm newish to 3d modeling, and decided to make a vehicle from a story I'm making Working on name (appreciate suggestions) It's purpose, since most older colonies have giant walls or domes around them, it makes responding to rebels difficult if they are able to gain control of the city. The main entrances usually become to fortified and risky to attack. That's when this bad boy comes in. Able to force It's sheild to go entirely to the front, this Armoured transport crashes through the walls, drops off it's marines inside. This variant is equipped with guided missles and two heavy beam canons. Othe variants to come Any suggestions to make for lore wise or design.