Hey there! Been lurking on this website for months now, but seeing this Tempest build I just HAVE to make a post!
This is awesome, and very inspiring! I have a nice collection of original cabs myself - including a Tempest - and I love seeing restorations of classics. I have a Defender here needing MAJOR restoration. Maybe one day I'll post the story on here!
Anyway back to the Tempest build! As I said this is one awesome project, and is looking superb already! Your skills are outstanding! I just can't wait for the end result! If I could help you in any way for details, I'd be more than happy, but it seems to me you've got it all covered.
Tempest is one of the most beautiful cabs without a doubt, a fantastic design.
I've followed your previous builds and have been totally impressed! The Galaga is one I may do myself - I have a Pacman cab so I could get measurements from that!

Total props (and then some) to you Scr33n!
Cheers
Jase