I'd say it looks pretty good. Even new smokers break in and don't look new but used after a few cooks!
Now since you asked about the inside. This is were you might curse me, initially at first......In one of your pics I could see a little bit of the inside of the vertical...
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So the trick to keeping a good and clean BBQ inside is starting with a good base. This is just me, but that is clean "bare" steal which is then properly seasoned. After this it is pretty simple.
So my suggest would be to clear your Saturday and get 2 or 3 drill based gator wheels, new wire brushes and some good dust masks (N95s would be best), gloves, face shield and arm and belly protection and then clean the inside down to clean metal You will have pits and such that you won't be able to get clean but don't work about that, just get the bulk of it as bare as you can. This includes the grates as well. Once its all bare metal, vacuum any dust out and wash it down with a stiff brush and hot water with dish soap and hose it clean and wipe it dry with an old t-shirt or something like that. Now you are ready to season it. I like to use canola or grape seed oil. You can buy spray canola oil to make it easier, ie just put a light spray over everything and use and old t-shirt to wipe as much of the excess off as you can. Then build a fire with lots of coals and keep it over 350 for at least an hour and then let it cool. Now it is clean and you are ready to cook.
Now the each time to keep it clean
So after each cook (and after I've eat usually) while it is still warm I use a SS wire brush to brush all the grates to knock any stuck food. Then once it has cooled (the next day or two) I use a large stiff spatula to scrape and grease of the base (I have a reverse flow plate you will just have the tuning plates, if you have them) to get any grease or food remainders cleaned (this stuff doesn't taste good when burnt).
Then when I go to use it again, I heat it up to about 300 and spray the inside down with a spray bottle to steam clean it and I also dump some water on the plate and close the door. After all the steam is gone, I wipe down the grates and were food may touch with a rag and its good to go for food.
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It sounds like a lot of work but its really not and it keeps your cooks much better, because as I said above burned grease and old food does NOT create good smoke, and in fact if you have old grease in the smoker and your smoker gets above 350 and it starts smoking it will most likely ruin your meat in very short order..... IE high temp cook tip....if you are doing a cook above 350 make sure the inside is clean and you pre-heat above 350 and burn out any remaining oil/grease before putting the meat on on or it will taint it.
Hope this helps......