Martin – Top of the bench to centre of hand wheel is 110mm. I am 6ft tall and hand wheel centre is 1015mm above workshop floor. I built the bench like this so I do not have to stoop.
Might be worth mentioning that my bench is on heavy duty castors and fixed to the wall by steel brackets which can quickly be unscrewed. This allows bench/lathe to be pulled away from the wall – carefully – for maintenance purposes (this has already paid of on several occasions.)
Hope this helps.
Rik