Smart to brace the booster for side loading. I hate to see them jiggle.
Do you not have a lathe? Or access to one? If you do, make the long nut from 1/2" to 3/4" round stock.
Steering wheels have to match two things: personal preference and vehicle character. It is a vintage rig, so something with a vintage vibe would be appropriate, but it is also a very modern rig, so high tech would also be appropriate. Are you going to use any sort of quick release hub? If not, then your wheel choices just got that much more limited.
That looks like a GM column (?), and I've always liked the look of late 70's to mid 80's Corvette steering wheels -
http://www.mamotorworks.com/Corvette/product/lecarra-3-spoke-custom-steering-wheel-612048-1 They are basically a nicer looking version of a circle track steering wheel and I think it would fit the character of your truck. I am a Momo guy though, probably due to my racing background, but a Momo probably wouldn't be the right choice for this truck, except for the basic classic three spoke variety.
This is the one I have in my '83 Toyota.