Surely having the bars that high is going to royally screw up the handling given it’s pretty high at the front anyway? And interesting you’ve gone for normal 29 rather than plus tyres?
Those Plus bikes do look good and a likely upgrade from my standard jones spaceframe one day when that style of riding becomes the primary rather than the secondary.
They do come with instructions now
Whatcha getting confused with?
Steerer is separate to the fork so you line it all up and insert (using a mallet) the steerer.