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The plan for replacing the box is actually to put a little kiddie seat for my 3.5 month-old (and possibly her friend) until the mrs agrees she is old enough for the baby seat on the back of a normal two-wheeler.
brakes definitely need attention - not sure if I can be bothered with new tyres, as they are an annoying 24" size, and the current ones don't seem terrible.
Goes without saying that seat will be replaced, and most likely the seatpost as well, as it should really go further into the seat tube than it is currently. Wish I could get the stem out further, but its already quite long, and some other bars would be nice, but as you say, marginal gains...
jdmitch-
Just a heads up re: carrying a small baby. Any bumps that are enough to shake their head are not good - make sure they can sit unsupported, holding their head up, before you put them anywhere near a bike. My son was 8 months I think, and even then trips were short.
This is CTC advice, not some bullshit 'always wear a helmet' government advice.
dglshrn
From the very few people i know who have ridden normal roadster or racing trikes.
Cornering at speed can be exciting, on the racey trikes they sort of hang off the side like in motorcycle sidecar units as you corner.
You have to adapt to the limits of the trike rather than expect to get a similar ride to a 2 wheeler.
On the plus side, you can't fall over (unless trying a high speed corner) very stable in ice and snow.
Changes could be costly for marignal gains, but tyres and brakes would be a good start.
The box is home made, that could be made lighter.
It's really a case of getting used to how a trike handles and living with it.
Does look a good working bike :)