The only problem I will say with the blending from 2 pedals is you have to be sat down to do it, though I did figure if this was something you wanted to do live a lot and be stood up if you reversed one of the volume pedals pot's so in the heel position it's on full volume and then you'd just move both together and one would get louder and one would get quieter, or
Sit down
That was the first thing I thought about when I actually saw the setup in your photo, but since the multiple channels and fades would be used mostly for studio work, that's fine.
I don't think I'd want to reverse the pots though as I don't necessarily want to strictly fade from one to the other but may sometimes want to bring both up full too.
Now I'm going to have to go back to the drawing board on the new board. Good thing it's only the base right now, I can still change things up. I had the VP Jr and the 105Q in the front center but now I'll need to have it VP Jr/105Q/VP Jr in the center.

