I came across this which got me thinking along these lines:-
Key
Yellow = steering tube
Red = sprocket
Blue dotted = chain
Make it all much lighter and a decent seat. Get the gears in the proper positions on the handlebars rather than as suicide shifters and you can add any rear end of your choice. If it's a bit tall for you (20" wheel = backside at 25"ish) you could even add a step on the front of the cargo area. You could also lower it by starting off with a higher rake on the forks and bringing the bottom bracket lower too. The biggest limit would be the bars have to be able to turn well like a Pashley style trike does which will limit the recline of the seat. The front steering tube could be angled back slightly taking a liberty with the chain as derailleur gears do to assist in keeping the steering twistable. You could even make different rear ends and swap them on a couple of bolts and quick detach cable connectors.
The big plus of this system is the rider pivots with the front so no python hip dislocation. This thing could even turn in it's own length. The big drawback would be steering chain failure though I'd think it unlikely a chain would fail in such light use.
Key
Yellow = steering tube
Red = sprocket
Blue dotted = chain
Make it all much lighter and a decent seat. Get the gears in the proper positions on the handlebars rather than as suicide shifters and you can add any rear end of your choice. If it's a bit tall for you (20" wheel = backside at 25"ish) you could even add a step on the front of the cargo area. You could also lower it by starting off with a higher rake on the forks and bringing the bottom bracket lower too. The biggest limit would be the bars have to be able to turn well like a Pashley style trike does which will limit the recline of the seat. The front steering tube could be angled back slightly taking a liberty with the chain as derailleur gears do to assist in keeping the steering twistable. You could even make different rear ends and swap them on a couple of bolts and quick detach cable connectors.
The big plus of this system is the rider pivots with the front so no python hip dislocation. This thing could even turn in it's own length. The big drawback would be steering chain failure though I'd think it unlikely a chain would fail in such light use.
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