I'm in the final stages of calibrating my LitePlacer and need to make a decision about building/buying a tape holder system. Some very good work out there which is great for this community. I have another design provided by a gracious LitePlacer user which I am considering as well as John's very elegant design and Malte's very solid work from last year. Given all the effort from John and the community, my preference would be John's approach but we haven't had a recent update (MakerFaire is a good excuse...

).
@johnSL: Have you committed to production? Any pricing hints? If you are making them for sale, any idea when they can be ordered? If not, the files on YouMagine seem fairly current. Would you recommend building from those? I would prefer to buy a set from you or @juKu if he puts them in his store.
@mrandt: I think your design is quite functional and far superior to the double-sided tape default which is proving to be quite maddening to set up (vision calibration is hard to stabilize across different black and clear tray sizes) and not amenable to the fast place option. Has your experience with your design proved to be workable solution? I have estimates for your printing feeder blocks with lids for about 10 USD each which isn't bad at all.
Thanks for an update.