you're lathing the crank, I don't disagree. I just dont have a lathe
However, for any vertical split cases I do put the bearings in the cases 1st. almost always, though I've done it the other way on a few hobits and tomos, just pulling it all together with longer case bolts essentially to drift it together. I prefer bearings in the case 1st tho.
But horizontal split cases like e50 and sachs? you gotta throw the bearings on the crank - and that's where i'm heating the bearing to get that expansion and make the temporary extra clearance to slip on, and then it cools and gives itself a nice firm fit!