Very well done.
As for the EL34's I have ran into height variations before and they caused me issues on my '66 Vox AC50 which doesn't have alot of room for the EL34's. I bused one sliding the chassis back in. So I know have to measure the height of the tubes when I retube to make sure they fit and I fliped the handel bolt around to give it a bit more room.
Any new amps in the design works, like a mini head?