Sorry for being so lazy adding pictures. Please note that the rear axle is not set up how its going to be. the sprocket and brake were just slid on. Also the chair will get another coat of black. Please leave comments on what you think
you need a 3-bolt adapter that fits the size of shaft that will be using (as well as being the correct size 3-bolt pattern). the adapters are usually welded onto the steering shaft, then you bolt the steering wheel to the adapter. or you can go extra fancy and get a quick release adapter. those still need to be welded on.
edit: ok, some of the adapters you can bolt on, others you weld on.