The attachment of the breast collar to the saddle girths looks a bit strange to me as well. Just in case, Garsault's "Le Nouveau Parfait Maréchal" may help. It was published a little later than our period (1741) but overall is valid for the WSS era as well.
To expand on my previous comment, I wonder if there will be any horses in the Dismounted Dragoons set or if it will just contain dismounted Dragoons and the intention is to share horses with the mounted set (hence the missing stirrups).
If the dismounted set is to contain horses then how many? Horses take up a lot of sprue space. A full complement of horses might be good for wargamers but would mean a small set of figures. A couple of horses with the horse holder might be fine for dioramists but leave the gamers short. If the intention is to share the horses between the mounted and dismounted sets there is the question of how to make it work with based horses. Mounted infantry type sets pose quite a dilemma for manufacturers.