BTW, I found this inexpensive rechargeable LED "keychain light" online (eBay or Amazon, can't remember which) and it works pretty well for lighting random one-off structures around the layout and/or Christmas display:
It's only slightly larger than a tea-light, but much brighter. It has two brightness settings and comes with a USB cord that can plug into your PC for a recharge. It also has a bottle-opener, which is really handy
Here's a few other in-process pics:
Printing on vellum paper is a bit tricky. I use an ink-jet printer, so sometimes the ink smears in the printing process. It does it randomly and only occasionally, so I just wait a moment, then reprint.