I have the schematic, send me an email and I can send it to you.
The LDC was From Tape Op: No. 25 •Sept/Oct 2001
The SDC was From a different issue.
Which are you looking for.
I have built 4 Royer Mods, 2 LDC (1 with a copy of the published circuit boards, 1 with boards I made myself from eagle), and 2 SDC's (handwired mics, my eagle for the PSU)
Let me know what you need, give me an email address to send it to.