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Bringing this back up from a mega dredge.
Where are these inserts from?
I have the base sorted, with those I'd be able to use plywood for the sides....
Chalfie-
Standard Bullitt ones, should be able to get them from any Larry vs Harry supplier. Don't really know where you can get them, but I have found an EU source for me.
For more consultation you can have a look into the assembly manual
I think you should be able to produce similar results with regular bolts, washers and nyloc nuts. You would need some kind of standoff or a larger L bracket, but I guess it would still be cheaper than paying LvH tax.
Ideal scenario would be to build your base a bit wider so it sits on top of the Bullitt frame, so you could just use regular L-brackets for the side panels. Would recommend using a fairly thick wooden base and countersunk hex bolts to attach it to the bike.
LeMesjeu
We have a normal human powered Bullit with a Gates and Alfine 8 setup also with the canopy and seat. Girlfriend uses it every day to drop off the little one on her way to work and she loves it (both the girlfriend and our daughter). I am having trouble claiming it back, she uses it for everything!
Have been thinking about a solution for widening the cargo bay in the summer with custom polycarbonate panels and machined inserts. But have been super busy at work so have not found the time to draw somthing up in CAD. The inserts will be largely based on the original ones and I still need to look at panel options. If there is any more interest for these bits it will bring the price down a bit.
For reference, the parts that need to be custom for widening the floor: