Waiting for a Cioks Expander 8 to turn up, so I can finish this off.
I ended up getting the Warwick Rockboard Quad 4.3 - it is about a wah pedals extra in length than the 4.4 I was using, which meant I could essentially get all of the pedals I wanted on there, with the proviso that the DD-500 could quite easily be a midi clock source pedal, and an additional noise-gate; perhaps a future tweak there.
But I do love the DD-500 for quickly jumping between a quarter note digital delay and a dotted 8th-note digital delay. Aside from that, I could quite happily take it off.
The MercuryX has kind of become a bit of a non-negotiable for me. I love it for huge atmospheric stuff. But I do like to stack effects quite a lot, so a 2nd reverb is also essential. The Golden is lovely, but something keeps bringing me back to the Hall and Mod modes on the RV-5, so I put that on there too. VP4 does great digital delays, compression, modulation if/when I need it. Source Audio Nemesis I use primarily for an analog delay sound, but I reckon I could probably ape it very well on the VP4 too.
The Tumnus kills. The Demhe Fuzz is probably the best fuzz pedal I've ever used to be honest, and sounds lovely with the wah going into it too.
Funnily enough, I am not really digging the VP4 for reverb duties. Too clean, not grindy or offensive enough. Not shit enough, basically.
I pretty much ran dual lock across every horizontal strip on the board, for maximum flexibility. Didn't need to around the volume and wah section, coz those are pretty fixed positions for those pedals both in terms of signal flow and layout.