Hi there, Goffe. I was trying to PM you regarding this but for some reason I am not able to. Are you able to send me a note when you get a chance? Or if an email works better, please reach me at the same user id on gmail. Thanks!Someone has built the F5 with the layout after all. I didn´t built this amp. One-side layouts are DIY friendly. I have done layout for BA-1 FE, BA-3 FE, BA-3B FE, X-ONO, UGS (Cheff design) and Sony VFET balanced FE. All one-sided no jumping wire and compact. I'll post it someday or send me a message.