i have the plan, but havent done anything yet, looks like we can copy the “originals” with this… make the piston drive the cutter, so its a mecanical thing. …but i had oxyarc in my mind the other day for cutting, can cut whtever we want in the end there, one string is enough for a lot of steel 
…but you need the oxy to…?..might go with a ponybottle… a thought towards the problem that comes …the way of ROV…