Floxed on ply and small MKNG-6 Al doublers. Was worried they may move around as plies go over the top, so secured the ply with a fibreglass rod peg in 2 corners of each doubler through NG-30 "top" ply.
Prepared foam and layed up 4 x BID over outer side of NG-30.
Added 1/8" Al doublers to NG-30 and covered with 2 x BID.