OK guys, time to step in with some answers 
lukx : He he he!
rattlesnake : Blood, drool, hydraulic oil and above all SILLY STUFF is coming… just need to cover the basics first 
soapy : Thanks, I’ll see if those cubans have something in XXXXL available to cover it up
SibSpi : You’re right about that. He came looking for trouble, and he found loads of it - - - He is not exactly the number one aerobics guy either… I’m in fact going to rebuild the… erm ‘lower’ drill and reposition those handles to fulfil modern ergonomical principles… It’ll be something bigger and better.
Cartesius : Several handles… yeah… it looked boring with only one 
Vilpep : Glad you like it! About the skin - this is just a quicky crap shader… nothing final.
harnelbe : Thanks for those illustrations. Now I see what you mean. I guess the thing here is that I’ve been referencing really OLD machinery, and those things were not very elegantly designed or well protected either for that matter… lots of exposed mechanisms on those… doesn’t hurt to combine these two ideas though… we’ll see what happens
I’m working on the interface between arm and hydraulic drifter/drill tonight… perhaps an update coming later… or not…