The past couple of weeks also doesn't look like Craig's been doing 500 each week.
Reading between the lines of Craigix's tweets, I think he can do around 500 lids a week, or install about 500 boards, test and ship a week:
Fri 7th Jan - "...trying to get all 550 built for midnight" (note built, not packed and sent out, and possibly not tested)
Thu 13th Jan - "New challenge for the end of the week - will we have shipped the full 550 units? Next week we're building LCDs..." (meaning the units from the previous week, I assume)
Mon 17th Jan - "Tomorrow we start building another 500 units" (I'm taking that to mean lids, although by now another 500 boards should have arrived)
Since then, radio silence. Actually it looks like it may be around 500 lids a week, 500 boards or 500 shipped. Damnit, I was working up to a two months gag and that overshoots us!