Thats not a hard model to make hardest part i think would be maping it without warping. Its even easier if you use a stock astroid ,copy it and size it smaller, flip the polys on the interrior model , attach it to the first and then cut out a box or 2 for the bays . here is my example i did this for our failed to get finished dark empire mod. Now for accuracy i cant help you yall know my skills