Mariner, shortening/lengthening a rack isn't a problem, 5 minutes work and I have examples less than 10 inches long sitting around (body length, rack is obviously longer).
The Lotus 63 is a mess around the front but you are right, quadrants are quite usable and I have a current option for it. Problem with a setup like the Lotus is every link and change in direction loses feel and gains in movement regardless of how good your links and joints are.
Just for those interested in the system and I didn't mention it above, the lower red radius rods are shorter in length than the upper ones which gains caster in bump, easy to look at my drawing and think it's just 4 parallel equal length links ..
Carlt, by chance do you have a picture of your setup?
Googling the words "steering rack mounted on beam axle" reveals quite a lot of information and some good pictures. Seems to be a fairly common practice on beam axle hot rods (and one example on an FSAE car).