Yes, it looks as if there will be a problem but there isn't, it is actually roomy inside. That roof is about 7" above the top of the door and to correct the vision thing i raised the windshiel up into the roof. If you look at the windshield wiper holes in the huge picture and the same holes are part of the cutout for the windshield.
There is enough headroom that i have a hoop as part of the tube chassis - no halo or 'A' pillar bars. The top of the roof will work out to 49" above the ground and includes 5" ground clearance.