Well, I don't think soldering smd components is that difficult, I soldered 5150 circuit with the same topology and components on a protoboard. That being said, I think you can substitute ES1J for any ultra fast high voltage rectifier diode, two paralleled bav70 for a single 1N4148 and the two bat54s for 4 1N4148, but wiser members than me should confirm or deny that.