Sometimes there is a need to transport another bicycle by bicycle. I used to just flip bike in top of Bakfiets box. It is quite unbalanced and noisy way to transport and it looks ugly too.
Drilled 10mm hole in wooden box to attach the front wheel from axel and old front hub on top of rear rack attached by U-shaped bracket. Rosti helped me with bracket, thanks!
"Duster" seems to be happier now.