There's is also the grid chokes. I highly recommend these as the maximum grid impedance for most of the finals under consideratin is 30kOhm( one heck of a load IMO ). I am checking into a new revision of these items with Nicklel laminations. Not going to be as inexpensive as M6 but I suspect it would be worth it.

Other parts required will be more MOSFETS. I think the SMT DN3545 item will work quite well with no other mods to the schematic. LND150's are chosen for their 500V D-S rating. 2 for each amp of the 7.5 uf caps like Guinevere's output couplers, one each of the 100 uf for the main PS. UX5 sockets for the finals. GZ34's for rectifiers ( new production will be fine, we are ~half of its ratings ).

The Guinevere power Iron should do the trick, and that leaves the inductor. The 10Hy/300 mA Hammond is probably easiest to acquire.

I'm in for a pair of Outputs, and likely a pair of Nickel grid chokes(if Nickel is affordable, probably a $35 or so premium, or something like double the anticipated cost ).
regards,
Douglas