Just a suggestion, as you have spent some time and money here to develope those;
I see that you have created compound angles at the sides of the mount, to allow them to clear the top of the fork caps, might want to consider early on (i.e. now) creating some more "relief" in that area (possibly like a cylindrical recess/cut out/counterbore) to allow those that have the need to lower the front end, the capacity to do so (dropping the trees on the fork tubes and exposing 1/2"-3/4" of the top).
Even though I don't need this option, many here have lowered the suspension, and I have seen broken hadlebars because the did so without realizing the forks were jammed against the bars, flexing them and placing undue stress on them. The current config of your design does not allow for "lowering" the front of the bike.
nice looking machine work though.