While posting something else, I had a thought take over about making an SB Cruiser-like box frame for CB2, to improve it's cargo carrying ability, and it would end up something like this:
where teh boxes at the rear are replaced with framed-in ones that are part of a seatbox like SB Cruiser's, though I'd still use the suspended-mesh seat CB2 presently uses, just bolted to the top of the seatbox instead. LIke SBC, the whole seatbox top and seat would fold forward to access teh inside of the box.
Teh steering and front fork would be the same, as well as handlebars, etc. I havent' finished the front triangle section but it'd be setup to hold the battery in it sort of like now, except not in an ammocan, but rather as sets of 4 to 6 cells as "book" blocks between cover panels.
The seatbox would not be as tall as SB Cruiser's, probably only a little mor than half as tall, but the rear boxes would remain the same size as the present ones, though shaped a bit differently at the bottom--instead of a regular box, they would have the outer bottom edge "bevelled" inward so tighter turns can be made (more lean before box strike on pavement would occur). I'd probably extend the seatbox downward with teh same bevelled area at it's outer ends, too (not shown in drawing yet). Would add a significant, if small, amount of storage space by doing this.
Not shown is triangulation beams; just to make the shapes clearer.
The whole frame should be stiffer than CB2's is presently, so I could probably revisit a middrive like the powerchair motors I used to mount under the frame by the cranks. I only abandoned that approach when hubmotors became an option for me, and I'd had so many derailments and parts destroyed.
If I used thin light wood to cover/fill the framespaces like i did on SB Cruiser, I might not need the triangulation of the boxes, as the wood would stiffen them being inside the frame itself.
I dunno that I'll ever build this, as the trike has more uses and I havent' even ridden teh bike in...a really long time (more than a year? two?). But I had the idea so I posted it so I won't forget / lose it, in case I do ever decide to revamp the bike and ride it again. Might be worth a complete rebuild, if so.