other than the lateral support to prevent the twisting on the steering column, got any other supports?
me and some friends were talking about it awhile back, and because the top and bottom support of the steering column is supported between rubber grommets, we felt that this wouldn't be too sturdy. it may also fatigue crack
Not to mention in a moment of panic you can produce about 1.5 times your body weight at the brake pedal. I'm not sure that the steering column may be the best place to mount it.
have you seen these?
may be more work but it will hold any shear and moment forces. plus you can make it adjustable