I understand what you tell me but I am a beginner.
My opinion: better learn to do it properly. It´s not more difficult but it saves you nerves, time and mone
I have assembled some simple circuits based on NE555.
I don't make PCB's.
I make drilled holes boards from wood (like Turret board) and I connect the components by wires and clamp wire connector.
I solder the NE555 pins to wires.
Simple question: Did you at least try this for a short time with full load? (or at least 50%)
For my Piezo horn use purpose it would be enough to work for just one minute at 60V and 1A.
To be clear: it will kill itself.. sooner or later. In worst case with an explosion causing fire.
Sorry to be honest: In my eyes it is a crappy circuit, a waste of time and money and it is dangerous.
It´s on you how you spend your time and money. I personally see no benefit in using this circuit.
* You may say you learn from it.
* I say you learn what already is known. I don´t need to learn that it hurts when I jump in front of a car. Others did that before .. with no real benefit for themselves.
There are many free and high quality tutorials around to teach you.
So you can chose to learn from experienced companies ... or from non educated hobbyists.
(Not that I want to generally make down hobbyists ... but in the case of your shown circuit .. I´m just honest with you)
I like to teach you how to do things right. But I don´t like to support you in burning down your house.
You chose.
Klaus