[alasyr]

My calculation using intermidiate designs for retrofiting (design total costs start = 21470 -> 32200 -> 48300 -> 72450 -> 108670 -> 163000 = final)
for cable & plating base use 201471 while built the normal way it would cost 163000 making it 38471 more expensive but 2-3 times faster.Designs and components are in attached spreadsheet.Only the Last retrofit is cost ineffective.