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Actually I make all my engines from solid. From the solid modeling you posted it doesn't look like there is a lot of complex details (fillets, bosses etc) to contend with so it shouldn't really be too big of a job. The only thing I can advise is to do all the hole drilling (major holes) and internal cavities first. The reason being is once the outside has metal removed and there aren't many square surfaces left it's hard to clamp or fixture the part to do the internals. Good luck on your project. I will be following along to watch the progress. gbritnell