@ixtab - Sorry I only just saw your post. It would appear that twobob has already reported success. Shout if there is anything else I can do.
@twobob - I realise this is too late now but it is safer to make a copy of the "start.sh" file which you then modify. Leave the original as it was so that the kindle always starts. To then test the framework do the following:
This way, if anything goes wrong it is enough to hit the power switch to hard-reset the device to its non-modified state.