Looks great! And you’re never getting your Mk3 one back, sorry, I love it too much!! On the plus side a few people have tried my amp out at gigs and they love it, so at least it’s being used to spread the GK joy around. I use mine with a modern GK CX210 and it sounds glorious.
I used to wonder why you owned so many but I am constantly on the hunt for another GK, but I’d actually want a 700rb just to have a bit more power available - not been short of it to be honest but I’d like to try one and it’s always good to have spares!!