I can't believe I missed this thread. Wow, that's quite a complex crossover and looks like a bear to figure out. How many burn-in hours do you have on it?
Something that comes to mind that I'm sure you may have thought of, but what about an external X-over showing off those cool Clarity caps? You could form a fiberglass dome and cover it with a black laquer of some sort rounding off the sides. Could go as far as using glass, plexi-glass but plexi isn't very chemical resistant.
Wouldn't look right sticking out 6" from the back but maybe 2-3" using a double stacked setup with 2 layers of components.
Could use all glass and have black edges to cover the joints.
Just throwing out ideas since I know you like the challenge. I know this is a moot point since it's already finished but I'm impressed you made it all fit.