That looks great, Tom.
I really enjoy grilling tuna but unless you're making a lot of tuna steaks, it's a pain to fire up the entire grill. Friend in the business gave me this tip: Use a charcoal chimney starter and a small grate from an old hibachi. What ya do is use a chimney starter like this:
Instead of filling it all the way up just fill it 1/3-1/2 full of charcoal. Once it gets to going just set a grate or grill from a hibachi on top and cook the tuna (or small thick steak filets) right over the chimney. Take note...it gets waaaaay hotter than a grill...perfect for searing tuna quickly. And you don't waste a whole load of charcoal on the grill either. Chimney like above is $12-18 at any big box store. Perfect if you're just doing one or two servings.
There are some clever alternatives to using newspaper to start it. Try paper towels loosely rolled up and sprayed with Pam. Less mess. Also you can flip it upside down and just used one layer of charcoal.