How to remove Roof Panels and Windshield?

Hello all. I am currently working on my 4 seater Gem. I am trying to remove the sunroof (replace) the panels in front and back of it, and the windshield.

I got a windshield removal tool and have been working at the caulking that seems to be holding these panels down but I am getting no where.

Has anyone ever removed these? Is there a trick? There has got to be a better way than what I am doing! :eek:

Thank you all and have a great day!

I recently purchased a Gem Car e4 and I need to replace both roof panels. I was wondering if you ever found out how to remove them? Thanks in advance for your help.