Gary, more pics please (you can never have too many of a Mossie ).
On the issue of whether you will get the kit finished in time, I would say, if you don't mind, just enjoy the build mate.
A lot of GB's are put together to give us modellers some focus on what to build next and to share a particular interest within the hobby.
A lot of us have been where you about the possibility of not finishing a build in time and I for one have made a kit a chore rather than a pleasure.
I've actually gone over the top with GB's this year and now realise I won't be able to complete them all, but that's fine so long as I focus on enjoying the hobby.
From the sounds of it, with the interior stuff all together to be painted over the weekend, you're doing fine anyway.
Look forward to your next update.
Deacon