[racket] Turning car/cdr into multi-methods

Hello everyone,

I'm implementing a scheme of my own for fun and education, and I'm stuck at
the following point. I'm wondering whether someone could give me some tips.

I have the basic forms and functions implemented, and was planning on doing
everything from there using macros.

I also now have a multi-method system built up using macros.

But it's annoying that the basic functions such as car/cdr are still plain
functions and not multi-methods like everything else. I've tried re-defining
them at this point, without much luck. Somewhere or other, I fall into an
infinite recursion.

Does anyone have some tips for wrapping their heads around recursive things
like this?
e.g. writing multi-methods using normal functions, and then somehow turning
everything into multi-methods?
   OR writing an object system, where your classes are also objects, etc...

Thanks!
  -Patrick
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