well i try to work them out in SolidWorks, but currently have no good version to continue it. So only use a basic program to create mock-ups of ideas i have
i only dessign them and use a standard material skin.
iff i got the shipsdraft, then i use "Solid Works 2008" to design them in real size. these pics are my drafts. the final pics are over 1GB, so don't load them here.