I've finished installing the lights now, and I thought it might be worth outlining briefly what (and how) I have installed. The choice of lights depended somewhat on what I had in my stash, because I only bought new lights for the attic.
Attic Level: I installed four matching ceiling lights whose wires go up through the foamcore ceiling and are brought together in the front right quadrant by drilling holes through the roof supports and feeding the wires through. The wire from a fifth light hanging inside the front dormer feeds up through the gap in the ceiling of the front dormer, and comes back to join the other attic wires.
All of these wires were soldered into a makeshift connector strip from a couple of pieces of copper tape. The tape is soldered to a wire which feeds down through the barrel roof, through the roof cornice, to connect to copper tape on the right hand outside wall.
Upper Stair: a hanging 3-light fixture is positioned over the stairwell, so that its wire can feed up into the empty roof space outside the attic wall, and from there come down the same gap as the attic wire and connects to the copper tape.
Bathroom: an out-of-sight bulb inside the toilet cupboard has its wire feeding across the floor (which will have a tile covering) and out a hole drilled above the kitchen bay. A one-light ceiling fixture in the bathroom has its wire hidden inside a routed out path in the ceiling (which I will fill) which feeds out a hole drilled in the right wall. All these wires connect to the copper tape on right hand wall. The copper tape runs down the side of the house and in through the cellar window where it connects up to the terminal block (to which the transformer can be connected).
2nd floor main room: a ceiling fixture near the front of the room has its wire feeding up into the attic (where a piece of furniture will be hiding it) and out the front attic wall and out the front wall. There it is glued along underneath the cornice to meet with copper tape on the left-hand external wall. A table lamp at the open end of this room feeds through into the toilet cupboard and across the bathroom floor and out the same hole as the other bathroom wires. A table lamp on the external (left) wall of this room feeds out a hole to join the copper tape on the left wall.
Kitchen/office: two ceiling fixtures come up into the bathroom, wires feed out as above. A wall sconce on the very back wall, near the bay, feeds out and down the external wall, and into the foundation where it joins the copper tape inside the foundation.
Main ground floor: a five-light hanging fixture feeds its wire up into the 1st floor near the archway entrance, where it will have to be hidden by a carpet, then runs out the front wall, along the porch roof, and meets the copper tape on the right wall. A wall sconce on the left wall feeds out a hole to meet the copper tape on the left wall. A wall sconce on the back wall feeds out, down the outside, and back into the foundation space.
Porch/display windows: Two 'fluorescent' tubes are positioned, one above each side, and connected to copper tape running along the underneath of the porch roof. This runs along until it meets the right wall and splices into the copper tape run there.
Now that the lights are in, I can go back to Step M and finish installing the roof.
Step M.J.4 (Mansard Roof /Left etc.): I installed the first piece of mansard roof according to the directions, and the mess in the picture is the result. I discovered that it is VERY important to run a knife along the scores on the back of these pieces, connecting the cuts right to the edge of the piece and deepening them. Otherwise they will not bend (despite what the directions say) and will just splinter and snap unevenly so that you don't get a smooth curve. I made the cuts on the other three roof pieces and they went in no problem at all. I found a small hammer very useful, because once the roof piece is snapped
into position it may still be bulging above the roof supports and not curving properly. If you lightly tap along the piece with a hammer, it will encourage the wood to break a little more along the score lines on the back of the wood, and it will hug in and curve to meet the supports. Use lots of glue.
Step M.L (top main roof): this was straightforward. I had to trim my left piece so it would go around my chimney (since I forgot to put it on earlier). I also had to trim the corners of my front and rear pieces to get them to fit in. Notice that the front piece fits under the little 'fingers' projecting from the barrel roof supports.
Step M.M. (Front dormer gable roof): these didn't fit all that well. I had to deepen the notch considerably on one piece, and the result is a bit wonky, but I think once it is all shingled, you won't notice it.