R.H.M.Designs Strip Wood Planer

My father Saw this ad in an old edition of "The Woodworker" magazine :- Strip Wood Planer Using a Standard Router An easy to make planer for accurately planing hard & soft woods to very small sections used in model & instrument making etc. Planes BALSA less than 1mm Hardwoods less than 0.5mm
Full Size Plan R.H.M DESIGNS, 68 Riverside Road,Newark,Nottinghamshire,NG24 4RJ. He wrote to them with a SAE they replied and said they no longer sell them. Anyone here help please? As I'm not the woodworker of the family please don't get too technical in your replies :0) Thanks in advance. Ford.
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