Welcome to the "not a a club" and the best of luck with your build, it sure looks like you're enjoying yourselves so far and MUCH respect for making the journey over to pick up the shell!
If you've seen my build thread then you'll see all the fun i had with the bonnet shut lines and even now i'm not 100% happy with how it turned out and i'm already planning on how i'm going to alter it all next winter (after a good summer of use!)
I don't think that there is any one way to do anything with these builds due to age and differences in donors and how we all want to tackle things, but knowing that i know now, i'd try and make up as much of your shut lines with fibreglass / jiggling before using any filler/bonding paste.
Dave