Looks good.

We tried the diet Coke thing last week at home & got it to shoot quite high.
Drilled a 3/16" hole in the lid & cut a little bigger hole in the plastic seal inside the lid. Then used an upholstery needle to thread 5 mentos onto some kite string. Pulled the string through the hole in the lid so that the mentos could be held-up out of the coke while screwing the lid back on. Let go of the string so the mentos dropped in & wooooo hoooooo, Coke geyser!

Hope you have fun with with it too.