To Stefan, thanks for your interest; I've just received your email and will reply directly.
Just a brief note about Mark's kind offer to send you the CAD file. I will now be slightly different due to a change of fork. It's current fork has 50mm offset (original: 43mm) and is 5mm shorter. It resulted angles increasing from 72.5 degrees both sides to 72.9, and the bottom bracket height reducing by 2mm. Personally I thought the change was to the better.