LEDs

Order of assembly and wiring steps (this is how I do it)

Paint everything one coat - Pre-finish the floors
Cut an E-slot in the Base Floor lined up with the E-slot in the upper floors
Sand until the paint is thin and transparent and lots of wood is showing thru
Build the housebody up to the roof (No Dividers)
Paint the Housebody - 2nd coat
Attach the Front Roof - not the Rear Roof or Attic Partitions
Lay the Main Loop of tapewire and leave 4" taped to the bottom of the base floor
Finish wiring the inside, testing between each step. I do a Sconce Loop in all rooms, connecting them on both ends ("Net" style)
Coach Lamp(s)
Attach the Foundation and Porch but not the Porch Roof
Ceiling lights in the Porch and maybe an outlet for seasonal decorations
Attach the Porch Roof
Finish the inside
Attach the Rear Roof
Shingle
Touch-up the painting

If you've come here after some of the above steps have been bypassed, don't worry - among the resources on the wiring page are ways to proceed working around most anything (except too much interior finishing... Stairs, Baseboard and Crown molding, Doors and Windows, those things I take out if I am going to use tapewire)