Hi there
Well you have to consider which is going to be the bigger problem ?
Getting drive to the rear of a Delta OR making the kingpins and steering for a tadpole ?
IMHO the tadpole is tougher and doubly so if you are using wood.
However there have been wooden trikes build in both configurations.
Probably the guy who has build the most wooden vehicles is Sakari :-
Sakari Holma
there are plans there and he can be contacted to help with details ...
There is also a small amount of older stuff here :-
Collection wooden bikes/trikes
Yes I constantly bang on about Pythons ? however in wood they are probably one of the easier builds ?
There is a pivot in the middle that can be made without welding and part from single sided wheels for the back [ which are optional you could use forks ? ] there are no hard parts to find ? [ above is one of Sakari's
regards Paul