On stocking custom slots

In the spirit of getting organized this spring, I want to explain how I'm going to be stocking for custom slots. It's a little awkward, but I like to use HC's system to track all the custom choices I offer.
Previously I had opened at stocking time and just kept track of quantities as orders came in, and then closed the system when I had as many orders as I felt I could handle in 10-14 days. That was not transparent to customers--no one could see my list, so no one knew when I would close off orders. I'm going to try a different method this time.
On April 14, I'm going to have "open ordering" from 9-11:30 eastern. I'm trying to have a range of time open so people don't have to be too rushed about making sure they pick the choice options they mean to pick.
If the slots sell out during that time (and they are for individual diapers), I'll add more. I suppose I could put in a huge quantity like 50 for each item, but that seems a bit scary to me! LOL
The downfall of doing it this way is that I may get more orders than I can complete in two weeks, so it may become longer between stockings. We'll see how it goes on April 14th and I'll adjust from there.