Paul,
Looking good there mate!
I hope this iteration of MBB trike is all you need it to be and 'shin-whacking' is not an inbuilt feature.
I'm still dickering with the touring Tadpole and will get back to the delightful delta as soon as I can.
I have thought about Pythonising a MBB delta, but it really needs a proper Duschar joint rather than a bodge (although, a bodge can be made to work well).
Good Luck, hope it rides well.