I ordered some bag parts from MMC Columbo in mid-April and received one reply email a week later apologizing and saying my package would be shipped the next week, and have heard nothing since then. I followed-up in mid-May (10 business days ago), and no response yet.
Is this typical? I realize if items aren't in stock, or need to be made, it might cause significant delays, but I've had total silence from him for over a month after he promised delivery within a week.

That puts me at ease, thanks Phil. I will say, a few weeks after I ordered from MMC, I ordered the same types of parts from Abbey England, and they came within a week. The quality is absolutely excellent. Looking forward to the day when I will be able to compare them.