I've added *.step and *.f3d files to the archive
of the k1100 throttle bodies that I have been working whilst looking into redesigning the air intake system on my 100RS.
Here are a couple still renders.
I will probably go back and create a simplified version that just give the bounding box/overall dimensions for those not needing the detail I've put into this version.
Here's a preview link to the file;
http://a360.co/2wiwGMK which lets you look around the file without downloading it/requiring software.
The model is not 100% finished but is not far away from being completed.