John,
Chugger/spitter type lures usually have a cupped, concave face that traps the water when you pull it forward. I haven't made any of them but I've thrown some striper lures, like the pencil popper, that have a variation of that feature.
You might try Googling striper lures and see what they look like. It might be a good place to start.
As far as hooks go, with a 100 lb tuna, you need some 4X strong hooks, in no less than a 4/0 treble. At least that's what I would put on them. Again, go to some salt water sites and see what the people who have already invented the wheel are doing.
For me, hook size has to do with line strength and rod action. Typically, the lighter the line, the lighter the hook, or you run the risk of breaking the line on the hookset. For tuna, you will probably be using at least 20lb, and probably 30 or 40, so heavy hooks are a must, since you will be able to put enough pressure on the fish to straighten out a light gauge hook.
Tuna are a visual predator, and have great eyesight. Remember, flourocarbon leaders were first used in salt water. I'd use some big eyes. Chartruese and black.
Lots of flash. And a green anchovie scheme, with lots of silver.