The stupidest thing ive heard yet...well,almost..
"Its normal for you to use a bit of oil"
Yeah ok its "normal" to use a bit,but its not normal or acceptable to burn a bit,especially just aftera rebuild.
The problem u describe is blowby by the sound of it,if you are burning oil(blue/Gray) smoke on acceleration I would say it is possible the cross honing on the bore isnt correct,therefore rings dont bed in,bores glaze,problem continues etc..
Dont worry,im not trying to scare you,its just one possibility,and a minor one at that if the guy knows what he is doing.Ask him if he cross honed the bores at 45 degrees,if he's a half decent bloke,he wont mind you asking that,its not like your trying to undermine his experience.
But...
Its usually always the simplest thing,Check the PCV Valve to,as someone else said,check the inlet pipe to your turbo,if theres oil in here,at least you know where its coming from then