I've simply made a symlink from the absolute path to the scratchbox home, in my 'real' home directory. I.e. $HOME/scratchbox -> /scratchbox/users/... etc.

This gives me easy access to the place in scratchbox where I have my software. I keep a couple of xterms open, one accesses the area via 'scratchbox', the other is my normal login. I use the latter to edit stuff with my normal editor, and I use 'git' to keep things under version control. The scratchbox xterm I use to actually build software, but everything else takes place in the normal login.