Here's my current noodled up thought (which will probably fail once I study the steering rack in greater detail) :
Get a tube that's the same diameter as the main body of the steering rack and cut a relief at the end of if to make it slip fit.
Slide it onto the rack and clamp it in place (t-bolt)
The tube is roughly 5'' long, same diameter as rack main body, and exists out of the chassis. About 1/2'' past the end of the chassis clamp the rubber steering boot onto it and then zip tie onto the inner tie rod
The only reason I can see this as a fail is because of the inner tie rod can move around a lot to accomodate suspension travel and you end up binding it against the tube (i.e., once the main body of the rack ends it needs that empty space in order to have full movement capability)
To get around that problem I thought of instead of using a rigid tube to extend, use a heater hose. Clamp one end of heater hose onto the steering rack, then the other end machine a ring that goes inside the heater hose (for rigidity) and clamp the rubber boot onto the heater hose (and zip tie othe rend onto inner tie rod).
Of course once I start talking about clamping heater hoses onto steering racks I begin to question myself :uneasy:
edit: I was looking at gt40 pictures and it seems like you guys also have the steering rack boot coming out through the chassis - surely everybody has an issue with boot life? The holes in my chassis are smooth so it's not like my boots are rubbing on sharp edges.