Here is the finished cap upgrade:
IMO, it looks impressive in a DIYish sort of way. Note the Speakon connector for the speaker cable. I removed high end Furutech binding posts and spades, but it didn't seem to matter. Speakons make audio life so much easier.
The crossover is now too large to enclose in a box, so I'm going to leave it naked and unashamed. So how does it sound? Well, with only a few hours of break-in, the sound is overall better without a doubt. More detailed and dynamic, definitely.
A big thumbs up for the Miflex caps.