Thought I'd give this an update finally.
All the parts are in for the most part. Have my stainless steel battery boxes made and mountable to the side of the trike, right behind where the seat sits. Just have to find some aluminum to make some custom covers for them. One will have my 48V->12V Dc converter in it, along with 4 of the 6S 5AH turnigys. The other will have a 100amp circuit breaker along with the other 4 batteries. The TPpacks LVC board and 8 12" 6S balance extenders mounts under the trikes tube, in between the two stainless steel boxes. The main charge plug will be secured out of that radioshack project box, once I get some better heat shrink wrap. (Do you know how hard it is to find sheets of shrink wrap in Boise ID???).
Mounted the controller just in front of my seat (power leads made more sense that way) with a piece of plywood and some 2" u-bolts. It works for now, but will be finding a piece of aluminum or stainless to exchange for the plywood. I like that I'll be able to reach the controllers power button when riding.
So now just figuring out a few things on the boxes before I label them as "complete". Mainly where I want the powerpole panel mounts to exit. Also wondering if I should add a 12V computer fan - I have room in the boxes to add an 80mm fan on each one to act as a vent, but not sure if it's a good idea or not as far as waterproofing goes. Will have to see how hot the boxes/batteries get come summer.
(Two paralleled bricks of 4 turnigy's per side, so 22.2V @ 20AH - then a serial connect line will run between the two boxes, finally equaling a 44.4V 20AH setup.
One point of confusion - is that a 12S2P battery, or a 12S4P battery? I have two packs making up the battery, so that makes me think 2, but I have 4 sets of serial connected batteries technically, so that makes me think 12S4P.
I'm short on pics, but I did shoot a little video last night when I was testing the setup after I got the battery pack all wired up. http://www.youtube.com/watch?v=-vtPrfcZne4&feature=player_embedded
I'm a bit irked though - after shooting this vid I was discharging the entire pack down to 60% (storage charge), since they might be sitting for awhile before I get it on the road. 40 minutes in, something sparked in the charger, and left me SOL. Hyperion USA has already said they will replace it though, so I sent my receipt, RMA form, and the charger back this morning.