Steering Column Help

Pic looks like you have removed the lower cross pin for the box coupling. That really should be installed before the shaft is inserted through the lower bearing. They are variations in designs. Some have those 2 sq. hd. bolts and I can remeber having them in with nuts loosely started then coaxing them into the notches before mentioned. Other columns have a screw knifed in from the bottom up through a little hole in the lower bell / collar.
The lower bearings vary in design too. Later one is a simple bicycle bearing and wont survive a lot of hammering ( like driving that cross pin in ).
Anyway... the shaft goes in from bottom up. The parts are stacked on like building a lamp and the snap ring above the upper bearing holds it in.
I'm guessing you have different types being merged together to build a column and that aint easy.
That first bell will need to be attached to the column tube, on way or another.
Thats all I got for you mate. With 1000 plus members here somebody will surely have more and better info.