Nice effort Dave,
The canopy is a bit easier to fold up if you score along the fold lines with the back of a blade. I've got one of these half assembled on the workbench, so I might have to get around to finishing it now.
Those "Aspen" horses do look like a nice casting. I have a few of the "Ian Lindsay Models" in my collection (I think he made about 4-5 different versions), but the Aspen collection looks nice as well. Since I will have a blacksmiths and stables on my home layout, I might need to look at collecting a few of those ones as well.
...if it looks about right, then it must be right