good job, that looks very professionaly done. A couple of tricks that could improve your job even better.
Un-shroud around the spark plug, clean up/taper around the spark plug hole to expose the plug end. This promotes better flame travel.
The intake side should not be polished mirror smooth. A slick surfaces in the intake and cylinder port will cause fuel to cling to the walls. A rough finish will keep the fuel particles in suspinsion. Keeps the air/fuel mixture stired up! the trick here is to keep the interior volume the same throughout the entire intake track in order not to alter the rate of velocity.
The exhaust side can't be too slick. you want the spent gasses out of there as fast as possible with no bumps or obstructions to disrupt the flow.
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