For a holder for HSS tooling I'm not sure it would be worth your time and effort and money if you had to buy the steel. But for carbide tooling then if you can lay your hands on some insert holders, 1" square work alright, 1-1/4" is better then you can make quick change tooling like these
The optimist says the glass is half full, the pessimist says it's half empty. The paranoid in me says somebody put a hole in it.
Remember pessimists are at heart opptomists. They know things can and will get worse.