Mark you sure have a "hands on" little fella helping you! I guess I'd go with the Ross column since it is the tightest and yes there are some nice aftermarket Hines or steering joints that can be used. You need to find a lift pin for the cast yoke...preferably a long lift pin with the two hole adjustment near the end of the pin. That way you can use a Brinly adapter for a plow,disc,cultivator,ect. If you so choose. Nice progress you are making!
Yes, my son wanted to do everything last night. I even let him use the impact gun(he has always wanted to use it) putting the tires back on. That wore him out having to hold that heavy of a tool.
I'll keep an eye out for the lift pin. Do they normally come with a tiller?