I opted for the Invader 6094 plate carrier in the end instead of waiting for the Condor Operator plate carrier to come back in stock. The two are very similar in their design insofar as they use large hook and loop panels layering things up to allow it to be taken on and off. You've got front and back panels joined by a cummerbund around the waist with the shoulder straps forming channels for water, power and other lines to be run from the back.
I tossed everything very quickly on the dummy as a sort of preview. In its stock form, it's designed for a much larger chest than mine so that will need some work. The dummy's chest is 38" and you can tell I could readily fit it over the top of the other vest I already had in place. The slack in the cummerbund panels is what's causing the side pouches to swing out. Resolving that lack of tension will be key to this being manageable.
It doesn't look like much but the cummerbund panels tuck under the loops in the back. Normally, those would be linked using a threaded series of eyelets to create a quick release feature. I've brought the edges of the cumberbund panels together to reduce at least 6" of girth. I've then tied the MOLLE of those panels together and fixing them down under the Velcro panel. That should hold it down and it's now nice and snug and tight.
With the water carrier on the back it sits a little lower down the back below the vest. There's nothing on the skirmish belt at the back so it won't interfere at all.
It needs more panels on the plate carrier to cover the black. In particular, the black shoulder straps need some covering. I'm not sure what I'm going to go with there. There are two options there. The first would be a Velcro panel that would let me add patches on. The alternative (and more likely) option will be two add some linen sheaths over the straps in blue or orange. That should then break up the black while also keeping the roughness of the Cordura from my neck. Bonus points is that it's a wicking fabric so it'll be cooling, too.
I've tried the carrier with the skirmish belt and it works pretty well. I've not managed to add the 40MAX shell carrier or the holster to that just yet. It'll probably be the next few steps I suspect. Then I'll come back to the plate carrier and add the neck guards along with the administration panel I'm going to need above the mag pouches. That will need a design spec of its own.