On Aug 19, 12:57 pm, Bob Simon wrote:
Can a hole be filled in such a way that would not be very noticable
with a clear coat finish?

Well, yeah, for about the cost of a new door, or thereabouts.

Can a good carpenter modify the door frame so the door will look good
and work well?

"Good" is kinda subjective, but I would suspect so.

What should be done about the missing 1/8" in width?

Nothing, probably, that's 1/16" per side... but that's relative to the
existing door, and not the opening, so that would depend on how well
the existing door fits.
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- gpsman