I didn't get a chance to play last night but sounds like you're making good prgress.
I'd highly recommend a CF HDD, you can pick up a CF card really cheap these days and I have spare's too if you want one known working, I also have spare CF-IDE adapters here as I used to offer a setup service.
I don't really do it much anymore due to time restrictions but I do the occasional one for forum members
You wont regret adding some storage though as it will unluck all the powers of your ACA620 which totaly transforms the A600. NSP will certainly benefit from the extra speed of the 020.
Good luck with your project!