Sanwa Button size question

I was thinking about using 24mm buttons instead of the larger 30mm buttons for my main 6 buttons.
There is no real reason why this is a bad idea right?
I want to minimize the distance between each button, I was even thinking of filing 50 percent of the outer lip off of each left and right side of the buttons so they would but up closer to each other.

Anyone else do anything like this?

No you wont have any issues
rtdzign uses 24mm as play buttons in his Ministick and they work great