When I got home, I raided my own stash of spare furniture to find all my own spare tables and shelving units, then had a lovely time playing with arranging the furniture in my future shop. I also picked up some baseboards, crown moulding, and some great right angle molding to cover up some of those tabs and slots.
Meanwhile, I have been spending a lot of time punching out the pieces for Steps L through to M/E, sanding, spraying, gesso, paint, zzzzzzzzzzzzz...... this is getting tedious. After carefully studying the picture, I think that the Bay Roof Trims in Step L are actually the final trim on these projecting bays. So before I glue them on, I have prepped them and painted them white, and I have painted the 'roof' of the bays with a mixture of black paint / glue / sand to give a textured 'flat roof' look. Likewise, the Mansard Cornice and Mansard Cornice Trim in Step M-C looks like it will be at least partially on show in the final product, so I have prepped them for painting. I haven't painted them yet because it looks like they will be built up in layers with some other pieces later. I can't wait to start gluing things on to build the house up more, but I am trying to control my impatience and do a good job on the painting - hopefully it is going to save time and awkward-reaching-into-the-house in the long run. I'm hoping to get to the fun part - the gluing - tonight.