I am building tadpoles trike with "dual crossed drag link" type steering, and having been using the spreadsheets below to get the Ackermann compensation right. I am however not really sure how to get best results. If anybody uses these, or had a more up to date/simpler resource to point me to, do let me know!
I am also familliar with the much simpler "point your control arms at the rear wheel", but I am not sure how to apply it to a tadpole trike with drag link steering.
Edit: Here's a picture of the Dual Crossed Drag Link configuration.