The circuit is in principle ok, but not really good.
There are a few strange things:
The reference filter cap should be towards GND - so the other half of the pot.
The number of output transistors depends on the needed current/ supply voltage. You may not need so many. At higher voltage the BD137 is rather weak to drive 4 of the 3055 - it's ok for 1 or 2 or with a < 15 V supply. The emitter resistors (0.1 Ohms in the plan should be larger (0.22-0.3 Ohms) for the 3055 unless you have well matched and thermally coupled ones.
The two parallel resistors set the current limit. The pot to adjust the current limit is not working well this way, as this will allow to increase the limit all the way to infinite. There is a better way, with having the ends of the pot between the base and emitter of the output transistors. The wiper goes to pin 2 and pin 3 is at the output. This will use the pot to reduce the current, maybe to 1/10 of the maximum value.
The filter cap at the DC input is suitable for about 0.5 A if behind transformer and rectifier, the current limit and the power transistors are more for a current in the 2-8 A range.
p.s.: A better plan would be here, under #11:
https://www.eevblog.com/forum/repair/300w-inter-m-r300-audio-amplifier-repair-stuck-in-'protection'/