for smaller rallyes (I know I will never do the Dakar) I use a similar set-up:
KTM navi tower (carefull they crack - I have added extra welds to mine)
2 IMO 10050R instruments (I used to run 1 Vector for speed & 1 IMO for distance)
carefull routing of cables
that's it. The setup is not as high as the dedicated Dakar towers, but
on the plus side I barely notice the weight on the handle bars.
similar setup up with one IMO on the XR on the left as well, old picture with the Vector:
The other tried & tested option is mounting onto the handle bars like so: