Hello Alan,
The crow is between 4 to 5 mm, I also added the wing fences based on what I read on this thread (I made them out of clear polycarbonate) , Jim said it didn't exhibit any bad stall tenancies so I guessed they worked.

I did not put on the lower ventral fins yet as a T-45 did not have those, it seems that the lack of their presence didn't make much difference.
Not sure when i will get to fly again, our weather is getting ready to turn to the bad side!