The signals I ordered from Scale Model Divsions have arrived. Serge Lebel at SDM did a wonderful job crafting these signals just as I wanted them. Here is a photo of one set of signals, to be used at one end of the siding.
I have on more set like this that I will use at the other end of the siding.
All of the targets (heads) are three color search signals (red, green, amber). The double target signal will protect the entrance to the siding, the single target signal will also be placed along the main line but on the other side of the turnout and facing in the other direction. Last, the dwarf will be used to control movements from the siding onto the main line.
Check out Carsten S Lundsten's excellent example on DTC signaling to see what I mean (the Danby siding signals).
Here are three more photos, showing close-ups of the three signals above. Excellent work - don't you agree?