T, now is a good time to put some roll bar padding above the helmet to ensure you have a enough clearance and them check for 120 degrees of forward vision. I would tack in those bars where you think they should be, put in a seat height base and back, then put on the helmet, climb in look around and climb out. Suggest doing this a lot from this point on.
Thanks, yes, I am doing that. Next step will be to add my backrest and lower tubes so I can pinpoint the seating. . I also have a call into ISP and am going to use their padding system. Their website has a very detailed form on the measurements they need to build a custom system.