The schematic is very similar to Merlin. No grid choke required. I should probably re-draw and mail the paper to Wayne for digitizig and posting.You might want to hold off with the Guinevere rebuild as 12B4 amplifier valves are a worthy experiment requiring a second socket and a bit of re-wire only.
Yes I'd support any and all questions on the 6V6 amp build.
regards,
Douglas