I'd keep plenty of headsets on hand for that design. The bicycle ones aren't designed to handle that type of leverage. Handling is an important aspect of bike design and I am not sure that one looks like it would do well outside of a straight line. Do some research on head angle, rake and trail and as you go along try and refine your work as it looks like you have the skills. Your customer base will help you to decide what is best for you to make also.
Stay at it.
"The future is already here, it is just not evenly distributed"