There's never been any solid information on what they produced. The guesses you've listed below are as good as anything. They also probably produced Elementals, but that's about it.Of course, come 3067 and it becomes a moot point
Apollo's Law- if it needs Clan tech to make it useable, It doesn't deserve those resources in the first place.
Sure it isn't the most practical 'mech ever designed, but it's a hundred ton axe-murderer. If loving that is wrong I don't wanna be right.
Alpin Wolf piloted a Thor during the Dragoon civil war so possibly those too.
Very true and he might have been all aglow with getting a Clan built machine but if he's the "leader" of the Dragoons he might want a Dragoon Omni to show he is fighting with home grown kit.