RE: Choosing Netbeans platform or Eclipse RCP
I don't see anything wrong with the reasons you've given: portability,
Swing, experience with the toolkit, documentation, short duration of the
project.
I don't know why you'd need an external document to validate those
claims. About the only thing that I guess you would need to defend is
"why can't you do Swing in Eclipse". I would hunt down that argument and
prepare to address it.
Regards,
Will Hartung