Looks great sure wouldn't know it was your first time.
I put my grinding head in the freezer to I just don't leave it in long enough to freeze. Instead of stocking up on the cheese and crackers think about putting cheese in the sausage

maybe even add some jalapenos to some of it the possibilities are about endless. When I do summer sausage I usually add cheese to all of it and jalapenos to about half that's in addition to the spice pack that I use.
Many people like to mix up there own spices and I have done that but found when I went to make sausage I was missing some spice I needed or it had gotten hard in the jar since the last time I used it so I just buy the pre made packs. When I find a spice pack I like I will use it and then add what I think it may need to suit my taste.
You can smoke to 152 internal as long as you used cure. When it reaches 152 I take it out and put it into an ice bath the idea being the ice bath will be colder than just tap water and will stop the temps from rising any higher faster.
A dedicated stuffer is a very wise investment as it makes life much easier for most of us there are a few that can use the grinder and it's easy for them but they are few and far between.
Have fun because it looks like your already hooked.
Hey have you tried making your own bacon yet that's another one that you'll be asking why you didn't start doing it long ago