nice effort Paul..have to say its better than anything I've managed to date..
its tricky this PST imaging, but you seem to well up the learning curve
BTW are you familiar with Larry Alvarez's work?
http://www.buytelescopes.com/gallery...ry.asp?c=38517
I once asked him what his techniques were and he -unusually for an amateur asronomer-said he wasnt willing to share.