Hello Sir.
I invite you to check my portifolio, and to feel free to ask me more info.
For this task, Im going to use a CAD software for modeling. Solid Edge ST6 has powerful tools for shape design, surface, solids, and hybrid modeling. The files are totally water-tight, without open faces, suitable for 3D printing, without the need of time consuming conversions, and heavy re-constructions.
Thanks for the opportunity
Best Regards