Oh yeah, I've made my own before as well. Really it's just about mixing all the dry ingredients together, maybe sometimes cutting in the shortening as well, then bagging it and using that instead. Really it is all the same list of ingredients with little variation in the quantity ratios. Just as with the Bisquik brand, you can also use it as the base for waffle, pancake, muffin and other quickbread recipes.

It seems, though that DaveT's mix ended up with too much liquid mixed in perhaps. At least that's what's happened when my biscuits have gone too long on the fire. Often they will collapse as well, the leavening having gassed out before the heat could set the dough firm enough to hold the structure. It's not a big deal, it all eats the same anyways, long as it is cooked through.

One of my favorite biscuit mix recipes is Coon Balls. Probably one of the top trail foods you can pack IMHO...