hi Lucian

I've seen your 2nd long tail bike on the other thread!

Yes, I know that tutorial. It's a nice build. I'm not sure about stifness. Front frame tubing does look a little thin.

I'd like to remove the top tube of the donnor frame (or rearrange both top and down tube completely) so that you can mount and dismount relaxed and easily. Not bad specially when you have kids on board.

I got one piece of information from the tutorial I didn't notice the first time:
steering angle is said to be 75º.

This is important I think.

I would love to know the steereing geometry parameters of renowned box bikes like CETMA, Worcycles Bakfiets, Joe Bike, Bullit, Metrofiets, and others.

Steering angle and trail would be nice.