Sorry my computer acted up and shut off my comment on me.
But anyways, I looked up a horse I used to own for reference, and it turns out she also had Sonny Dee Bar and Boston Mac crossed on her lines.
But I will show you an example of an Appendix (generally used for things like jumping, western pleasure, hunter, etc..), a foundation (used for ranch, rodeo, trail, or halter), and a halter horse.
And it is hard to say what yours is because the type is based on conformation, so we would need to see pictures.
Foundation horses have a big body build, and they're built for power. Most halter horses are foundation horses: ST_Lynns_Concord_Music_0209.jpg PERPETUALISM.jpg andykcspring2001sm.jpg
And a appendix horse generally has a smaller body build, bur may have a longer back or neck, and generally has longer legs. Their bone structure is smaller than that of a foundation horse. A lot of them are taller too: Mia.jpg