Wow. Strange. Very strange.
First and foremost, there isn't a basic schematic to UNDERSTAND the circuit. What's the use in building these things without fostering an understanding of how and why it works?
No measurements that I can see. I could go expand much further on that topic but no need to beat a dead horse!
Next, the board and board layout appear woefully average, in particular the mounting of the MOSFETS. A capacitor input supply (which is fine) with 6800 uf of capacitance. That's it. No organization of the wires whatsoever, particularly twisting them and routing them. Any concerns for EMI or RFI?
The writer of the article is asking for experienced individuals with soldering capability and yet the pictures show average soldering capabilities to my eyes.
Oh well...there are plenty of full kits, partial kits and bare boards that can compete with this from DIYAUDIO, AKITIKA and beyond...
To the moderators, this thread really belongs in the Lab forum.
Best,
Anand.