Hello again!

I'm finally CADing my design. Quick question to all you experienced ppl, how high should you raise your x-rails?

I'm thinking about using 20mm sacrificial bed and want maybe 60mm workable Z depth when finished.
Can't see me doing any job higher than that.
So 20mm bed, 60mm work, 50mm tool? And then the collet and lower gantry bearings and plate add another 70mm?

Cheers
/madman