I am considering to build a class D amplifier based on Cezar Chirila's article of August 2018. I have few questions: 1) Is there anyone who has built it? 2) How do I access the PCB files both in PDF format and as KiCAD files? I cannot access them by clicking on the Goodies Zip files it logs me out of the website and takes me the forum discussions. 3) What other BJT can I use instead of the BD241C? I cannot find it on KiCAD library.