No, I don't have any additional information available other than currently available on the website.
For the RDF41 I chose for a working kit to lower the threshold for people who don't have any electronic background.
The predecessing V2,3 conventional doppler had to be built almost from scratch, since I only offered bare PCB's.
Unfortunately this approach produced a lot of emails of people that were not able to get things working.
I spent way too much time trying to help them out.
Therefore I chose for the "almost ready to use" approach this time.
I don't have any experience with the raspberry pi, so if you want to use the pi as the core of a RDF you will have to do some deelopment yourself

However, there's a lot of generic info about RDF's on the website that will help you to make the right decisions during the prcess.
Within a few days I hope to add some more antenna designs for the UHF dopplers/amplitude RDF's
73,
Wil
pa8w