I'm glad you have reverted to the original front axle design,  don't let it worry you, fortune favours the brave.

If you build the front end with the thought that you may have to change the layout if things don't go to plan it won't be an irrevocable decision,  i.e. allowing for retro fitting other axle mounts etc.

But if it worked for the real one you have a good chance it will work for you, and will make a fantastic and unique cyclekart. Good luck with the build I look forward to seeing the build.

Peter