Modding the Philips EL6425

I recently bought a 1961 tube mixer Philips EL6425.
I thought it looked kind of soviet-industrial and that it could find a place in my studio setup.
Ultimately, my goal is to send audio from my soundcard through the mixer, get some analog colouring, and back into the soundcard again.
The mixer came equipped with some EL36, EF86 Telefunken, RCA and Philips tubes.
Taking off the awful chassis revealed a sturdy, almost bombproof mechanism, just begging to be modded. Or just altered a bit.
I've decided to go for a 1960's hot-rod-smooth-lines-and-heavy-lacquer feeling.

These are the "before" photos:

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