Seems to be quite a controverse topic!
I am in no way an engineer. But one thing seems to be clear to me: the load will ONLY be distributed if the webs are tightly connected.
I agre it would be even better to just put a web between the spars. With a 1/16 vertical grain bals piece it seems to be easier to do it the way I described. Ultimately, because of the tight fit, the loadwill be distributed over all the webs.
You are correct that if you have a vertical and a horizontal force the result will be what I know as a vector and by no means in either of these directions. Since you can use wood only with the grain vertically or horizontolly there is little you can do other than maybe using the above mentioned carbon webs.

The structure seems to be very sturdy and solid with little added weight. I'll let you know if it did not work ok, promise

Cheers

Steff