I've also been going through SICP, using racket. However, I've been using Neil van Dyke's SICP-compliant support package, so I feel my use is closer to SICP scheme than racket (if that claim even makes sense)

I use this line at the top of my scripts :

#lang planet neil/sicp

See here: http://www.neilvandyke.org/racket-sicp/