Without wanting to be nosey, this is a subject that has always interested me too. Up until recently I worked engineering works on mostly dockside cranes. Erection, dismantling, crane design, consulting on the use of all sorts of mobiles. Now do basically the same thing for cranes on oil rigs. Have also done precision engineering apprenticeship, programming and setting CNC machine tools, BEng in mechanical engineering, and worked engineering the movement and lifting of abnormal loads, was asked to project manage the biggest land crane in the world but the money was rubbish.