"...a basic Springfield 1911..." Which one? Their GI .45 is about as basic as they get, but putting better sights on one isn't a big deal. More about the front sight. Their alleged 'Milspec' comes with fixed high visibility sights. It's not a big deal to put an adjustable rear sight on either. As long as the heights match.
"...Any decent smith with some machine skills..." Any decent smithy. Machining skills aren't required. Knowing how to install a front sight is though. No machining involved.
Doing a trigger job on a 1911 isn't rocket science either. Installing a new trigger is more involved. Requires fitting.
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