I haven't seen instructions, but the lower bearing to fit is available from some of the usual restoration suppliers.

Pretty much just remove the wheel, measure how much the stem sticks out so you can replicate that measurement.
Then cut off the column from the box but extra long. Then figure out how long you want it and trim the tube to length. Install bearing and slip the center shaft back in as previously measured.
Now depending on which telescopic shaft you use adjust length and machine the end to suit.

Still need to make a bracket to clamp on bottom of column and bolt to the floor.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-